[TableGen] Optimize intrinsic info type signature encoding (#106809) Change the "fixed encoding" table used for encoding intrinsic type signature to use 16-bit encoding as opposed to 32-bit. This results in both space and time improvements. For space, the total static storage size (in bytes) of this info reduces by 50%: - Current = 14193*4 (Fixed table) + 16058 + 3 (Long Table) = 72833 - New size = 14193*2 (Fixed table) + 19879 + 3 (Long Table) = 48268. - Reduction = 50.9% For time, with the added benchmark, we see a 7.3% speedup in `GetIntrinsicInfoTableEntries` benchmark. Actual output of the benchmark in included in the GitHub MR.
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