Reland "[ARM] push LR before __gnu_mcount_nc"
This relands r369147 with fixes to unit tests. https://reviews.llvm.org/D65019 llvm-svn: 369173
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This relands r369147 with fixes to unit tests. https://reviews.llvm.org/D65019 llvm-svn: 369173
mentioned in commit f71e218b