[PATCH] Activate UBSan for Power

[Bill Seurer]

Hi wschmidt, hfinkel, echristo, kbarton, nemanjai,

This activates UBSan for the power architecture.

One test case is updated to allow for differences between power and other architectures in behavior when returning from main in certain instances.

http://reviews.llvm.org/D8743

Files:
  projects/compiler-rt/cmake/config-ix.cmake
  projects/compiler-rt/lib/ubsan/ubsan_platform.h
  projects/compiler-rt/lib/ubsan/ubsan_value.cc
  projects/compiler-rt/test/ubsan/TestCases/Float/cast-overflow.cpp

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