[PATCH] [ARM] Align stack objects that may be memcpy'd

[hfinkel at anl.gov]

In http://reviews.llvm.org/D7908#130548, @john.brawn wrote:

> Zero change in stack consumption in any EEMBC benchmark (I haven't checked SPEC). Also by CodeGen time we don't know if we're compiling -Os/-Oz as we just have CodeGenOpt::Level.


No, the size optimization attribute is independent of CodeGenOpt::Level. You can get at it from CodeGen by querying:

  MF.getFunction()->hasFnAttribute(Attribute::OptimizeForSize);


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http://reviews.llvm.org/D7908

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