Vedant Kumar 116aebcae0 [ubsan] Don't check alignment if the alignment is 1 ...

If a pointer is 1-byte aligned, there's no use in checking its
alignment. Somewhat surprisingly, ubsan can spend a significant amount
of time doing just that!

This loosely depends on D30283.

Testing: check-clang, check-ubsan, and a stage2 ubsan build.

Differential Revision: https://reviews.llvm.org/D30285

llvm-svn: 300371

2017-04-14 22:03:37 +00:00

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