[NFC] Header cleanup

Removed some unused headers, replaced some headers with forward class declarations.

Found using simple scripts like this one:
clear && ack --cpp -l '#include "llvm/ADT/IndexedMap.h"' | xargs grep -L 'IndexedMap[<]' | xargs grep -n --color=auto 'IndexedMap'

Patch by Eugene Kosov <claprix@yandex.ru>

Differential Revision: http://reviews.llvm.org/D19219

From: Mehdi Amini <mehdi.amini@apple.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266595 91177308-0d34-0410-b5e6-96231b3b80d8

10 files changed, 4 insertions, 14 deletions

diff --git a/utils/TableGen/AsmMatcherEmitter.cpp b/utils/TableGen/AsmMatcherEmitter.cpp
index 589d81c4eb2..b08cecf5b02 100644
--- a/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/utils/TableGen/AsmMatcherEmitter.cpp
@@ -112,10 +112,9 @@
 #include "llvm/TableGen/TableGenBackend.h"
 #include <cassert>
 #include <cctype>
+#include <forward_list>
 #include <map>
 #include <set>
-#include <sstream>
-#include <forward_list>
 
 using namespace llvm;
 
diff --git a/utils/TableGen/CodeEmitterGen.cpp b/utils/TableGen/CodeEmitterGen.cpp
index c74f80e4617..400913e3274 100644
--- a/utils/TableGen/CodeEmitterGen.cpp
+++ b/utils/TableGen/CodeEmitterGen.cpp
@@ -15,7 +15,6 @@
 
 #include "CodeGenTarget.h"
 #include "llvm/ADT/StringExtras.h"
-#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/TableGen/Record.h"
 #include "llvm/TableGen/TableGenBackend.h"
diff --git a/utils/TableGen/CodeGenInstruction.h b/utils/TableGen/CodeGenInstruction.h
index bfdc2c62dce..8e371aff0e0 100644
--- a/utils/TableGen/CodeGenInstruction.h
+++ b/utils/TableGen/CodeGenInstruction.h
@@ -14,7 +14,6 @@
 #ifndef LLVM_UTILS_TABLEGEN_CODEGENINSTRUCTION_H
 #define LLVM_UTILS_TABLEGEN_CODEGENINSTRUCTION_H
 
-#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/CodeGen/MachineValueType.h"
 #include "llvm/Support/SMLoc.h"
@@ -23,10 +22,10 @@
 #include <vector>
 
 namespace llvm {
+template <typename T> class ArrayRef;
   class Record;
   class DagInit;
   class CodeGenTarget;
-  class StringRef;
 
   class CGIOperandList {
   public:
diff --git a/utils/TableGen/CodeGenRegisters.h b/utils/TableGen/CodeGenRegisters.h
index dc441436537..83b5996b45b 100644
--- a/utils/TableGen/CodeGenRegisters.h
+++ b/utils/TableGen/CodeGenRegisters.h
@@ -19,22 +19,21 @@
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SparseBitVector.h"
 #include "llvm/CodeGen/MachineValueType.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/TableGen/Record.h"
 #include "llvm/TableGen/SetTheory.h"
 #include <cstdlib>
+#include <deque>
 #include <list>
 #include <map>
-#include <set>
 #include <string>
 #include <vector>
-#include <deque>
 
 namespace llvm {
   class CodeGenRegBank;
+  template <typename T, typename Vector, typename Set> class SetVector;
 
   /// Used to encode a step in a register lane mask transformation.
   /// Mask the bits specified in Mask, then rotate them Rol bits to the left
diff --git a/utils/TableGen/DAGISelMatcherGen.cpp b/utils/TableGen/DAGISelMatcherGen.cpp
index 9663b71d662..cac11016514 100644
--- a/utils/TableGen/DAGISelMatcherGen.cpp
+++ b/utils/TableGen/DAGISelMatcherGen.cpp
@@ -10,7 +10,6 @@
 #include "DAGISelMatcher.h"
 #include "CodeGenDAGPatterns.h"
 #include "CodeGenRegisters.h"
-#include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/TableGen/Error.h"
diff --git a/utils/TableGen/DAGISelMatcherOpt.cpp b/utils/TableGen/DAGISelMatcherOpt.cpp
index c9ee371e3e2..ffb2ec23f3e 100644
--- a/utils/TableGen/DAGISelMatcherOpt.cpp
+++ b/utils/TableGen/DAGISelMatcherOpt.cpp
@@ -13,7 +13,6 @@
 
 #include "DAGISelMatcher.h"
 #include "CodeGenDAGPatterns.h"
-#include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/StringSet.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
diff --git a/utils/TableGen/DFAPacketizerEmitter.cpp b/utils/TableGen/DFAPacketizerEmitter.cpp
index 17e9e40acd4..0e74a2f29ae 100644
--- a/utils/TableGen/DFAPacketizerEmitter.cpp
+++ b/utils/TableGen/DFAPacketizerEmitter.cpp
@@ -24,7 +24,6 @@
 #include "llvm/TableGen/Record.h"
 #include "llvm/TableGen/TableGenBackend.h"
 #include "llvm/Support/Debug.h"
-#include <list>
 #include <map>
 #include <string>
 #include <queue>
diff --git a/utils/TableGen/FastISelEmitter.cpp b/utils/TableGen/FastISelEmitter.cpp
index 748c9234778..ba96bff5d7d 100644
--- a/utils/TableGen/FastISelEmitter.cpp
+++ b/utils/TableGen/FastISelEmitter.cpp
@@ -18,7 +18,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "CodeGenDAGPatterns.h"
-#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
diff --git a/utils/TableGen/SequenceToOffsetTable.h b/utils/TableGen/SequenceToOffsetTable.h
index 66506ea0638..e026b1c9fbf 100644
--- a/utils/TableGen/SequenceToOffsetTable.h
+++ b/utils/TableGen/SequenceToOffsetTable.h
@@ -22,7 +22,6 @@
 #include <cctype>
 #include <functional>
 #include <map>
-#include <vector>
 
 namespace llvm {
 
diff --git a/utils/TableGen/X86RecognizableInstr.h b/utils/TableGen/X86RecognizableInstr.h
index d25eeea5018..f6f50065f70 100644
--- a/utils/TableGen/X86RecognizableInstr.h
+++ b/utils/TableGen/X86RecognizableInstr.h
@@ -19,7 +19,6 @@
 
 #include "CodeGenTarget.h"
 #include "X86DisassemblerTables.h"
-#include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/DataTypes.h"
 #include "llvm/TableGen/Record.h"