[ValueTracking] AllowEphemerals for alignment assumptions. #10135
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Precommit tests from llvm#108632. (cherry picked from commit 383a670)
Allow AllowEphemerals in isValidAssumeForContext, as the CxtI might be the producer of the pointer in the bundle. At the moment, align assumptions aren't optimized away. This allows using the assumption in the computeKnownBits call in getConstantMultipleImpl. We could extend the computeKnownBits API to allow callers to specify if ephemerals are allowed, if the info from computeKnownBitsFromContext is used to remove alignment assumptions. PR: llvm#108632 (cherry picked from commit dce5bf8)
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