[PATCH] Allow case-insensitive values for -march for AArch64 target in line with GCC.

[Gabor Ballabas]

Hi Richard,

In http://reviews.llvm.org/D10535#190213, @richard.barton.arm wrote:

> Again no test that the case insensitivity also applies to the feature extensions. Other than that, this seems the same as the previous patch about -mcpu and I see no reason not to commit it.


I added the feature tests for the final version of the patch.

Thanks,
Gabor


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