[PATCH] [compiler-rt] Do not use ldrexd or strexd on v7M

[Renato Golin]

Hi Oliver,

If these macros are not defined, wouldn't that become a compilation time error on any code that use them?

Unless they're defined by something else (OS-specific headers?), there should be an #error stating the lack of support, or some other way to help the user identify the problem earlier.

cheers,
--renato

http://reviews.llvm.org/D5490