[PATCH] [UBSan] Adding support of MIPS32

[Sagar Thakur]

Changed files:
sanitizer_stacktrace.cc: Considering the delay slot in MIPS32 PC should be subtracted by 8.
ubsan_handlers.cc: __ubsan_handle_float_cast_overflow should give callers PC to handleFloatCastOverflow to print the correct location. Else it prints the location of call site to be in ubsan_handlers.cc itself.
cast-overflow.cpp: Added support for big endian machines to cast-overflow test case.

http://reviews.llvm.org/D4881

Files:
  lib/sanitizer_common/sanitizer_stacktrace.cc
  lib/ubsan/ubsan_handlers.cc
  test/ubsan/TestCases/Float/cast-overflow.cpp
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