[InstCombine] tmp alloca bypass: ensure that the replacement dominates all alloca uses
After 077bff39d46364035a5dcfa32fc69910ad0975d0,
isDereferenceableForAllocaSize() can recurse into selects,
which is causing a problem for the new test case,
reduced from https://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20210412/904154.html
because the replacement (the select) is defined after the first use
of an alloca, so we'd end up with a verifier error.
Now, this new check is too restrictive.
We likely can handle *some* cases, by trying to sink all uses of an alloca
to after the the def.
GitOrigin-RevId: 2fea5d5d4accf3490854b064a51d1db049b1de64
3 files changed
