Reset LOCAL_2ND_ARCH_VAR_PREFIX before referencing it.

Change-Id: I9182ce1efe09609100d19c9fae2bc4fe7358dfc0
Merge "Reset LOCAL_2ND_ARCH_VAR_PREFIX before referencing it."
Set default to Clang integrated assembler.

BUG: 17820427
Change-Id: I10a6ddd94aad083665164d7939990e148b3b6efb
Merge "Set default to Clang integrated assembler."
Merge pull request #1 from android/master

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