Roman Lebedev 9cf08c6de1 [Constant] Add 'isElementWiseEqual()' method ...

Promoting it from InstCombine's tryToReuseConstantFromSelectInComparison().

Return true if this constant and a constant 'Y' are element-wise equal.
This is identical to just comparing the pointers, with the exception that
for vectors, if only one of the constants has an `undef` element in some
lane, the constants still match.

llvm-svn: 369842

2019-08-24 06:49:51 +00:00

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