Create a local value numbering pass

Creates a pass that removes redundant instructions within the same basic
block.  This will be implemented using a hash based value numbering
algorithm.

Added a number of functions that check for the Vulkan descriptor types.
These are used to determine if we are variables are read-only or not.

Implemented a function to check if loads and variables are read-only.
Implemented kernel specific and shader specific versions.

A big change is that the Combinator analysis in ADCE is factored out
into the IRContext as an analysis. This was done because it is being
reused in the value number table.

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