[PATCH] [MIPS64] Make __clear_cache more optimal

[Petar Jovanovic]

@danalbert, it is useful, and it will be enabled in later changes.
It shall also be followed with additional conditionals, like - check whether '-msynci' is set before we use it, etc.
The need for this change comes from Android build, thus we are making sure we fix Android build here first.


http://reviews.llvm.org/D6661

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