Sumanth Gundapaneni a9049ea368 Use ".arch_extension" ARM directive to specify the additional CPU features ...

This patch is in response to r223147 where the avaiable features are
computed based on ".cpu" directive. This will work clean for the standard
variants like cortex-a9. For custom variants which rely on standard cpu names
for assembly, the additional features of a CPU should be propagated. This can be
done via ".arch_extension" as long as the assembler supports it. The
implementation for krait along with unit test will be submitted in next patch.

llvm-svn: 230650

2015-02-26 18:07:35 +00:00

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