David Majnemer a38c9f1fa5 [MS Volatile] Don't make volatile loads/stores to underaligned objects atomic ...

Underaligned atomic LValues require libcalls which MSVC doesn't have.
MSVC doesn't seem to consider such operations as requiring a barrier
anyway.

This fixes PR27843.

llvm-svn: 270576

2016-05-24 16:09:25 +00:00

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