Simon Pilgrim d9f064dc0b [InstCombine] visitTrunc - trunc(shl(X, C)) --> shl(trunc(X),trunc(C)) vector support
Annoyingly vectors aren't supported by shouldChangeType(), but we have precedents for always performing this on vector types (e.g. narrowBinOp).

Differential Revision: https://reviews.llvm.org/D89067
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This directory contains test cases for the instcombine transformation.  The
dated tests are actual bug tests, whereas the named tests are used to test
for features that the this pass should be capable of performing.