[SILOptimizer] Remove Identity instructions - Peephole in SimplifyInstruction #5633
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radar rdar://problem/29056555
Encountered patterns of extOrBitCast_Int64_Int64(x) -> x and truncOrBitCast_Int64_Int64(x) -> x
These instructions are basically identity instruction when the two types are the same.
PR adds support for this pattern in SimplifyInstruction + unit test(s)