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Revert "[InstCombine] try to narrow a truncated load"

Authored by vlad.tsyrklevich on Jul 25 2019, 8:37 AM.

Description

Revert "[InstCombine] try to narrow a truncated load"

This reverts commit bc4a63fd3c29c1a8ce22891bf34ee4dccfef578c, this is a
speculative revert to fix a number of sanitizer bots (like
sanitizer-x86_64-linux-bootstrap-ubsan) that have started to see stage2
compiler crashes, presumably due to a miscompile.

llvm-svn: 367029