[PATCH] Add tests for the default value of Tag_CPU_unaligned_access.

[Charlie Turner]

Add tests to make sure the build attribtue Tag_CPU_unaligned_access is correctly set in the absence of the -arm(-no)-strict-align options.

This patch also adds a couple of missing tests that check Tag_CPU_unaligned_access is correctly emitted for v6 cores when the -arm(-no)-strict-align options are given.

http://reviews.llvm.org/D6022

Files:
  test/CodeGen/ARM/build-attributes.ll
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