Matt Arsenault eac81b2448 AMDGPU: Ignore any_extend in mul24 combine ...

If a multiply is truncated, SimplifyDemandedBits
sometimes turns a zero_extend of the inputs into an
any_extend, which makes the known bits computation unhelpful.
Ignore these and compute known bits for the underlying value,
since we insert the correct extend type after.

llvm-svn: 331919

2018-05-09 21:11:35 +00:00

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