David Majnemer fc80b6e5d8 [MSVC Compat] Don't provide /volatile:ms semantics to types > pointer ...

Volatile loads of type wider than a pointer get split by MSVC because
the base x86 ISA doesn't provide loads which are wider than pointer
width.  LLVM assumes that it can emit an cmpxchg8b but this is
problematic if the memory is in a CONST memory segment.

Instead, provide behavior compatible with MSVC: split loads wider than a
pointer.

llvm-svn: 258506

2016-01-22 16:36:44 +00:00

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