[PATCH] [UBSan][MIPS] Use unsigned value while bit shifting on MIPS

[Sagar Thakur]

The type of SIntMax is `__int128`. The value of ExtraBits is 64 when `getType().getIntegerBitWidth()` returns 64 and it is 96 when `getType().getIntegerBitWidth()` returns 32.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9247

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