[PATCH] [compiler-rt] Make the MSAN wmemset intercepter call wmemset instead of memset. Fixes PR 21579

[Eric Fiselier]

Hi kcc, eugenis,

Exactly what the title says. I've tested this change against the libc++ test failures and it solves all of them. The check-msan rule also still passes.
I'm not sure why it called memset originally. 

I can add tests if requested but currently there are no tests involving wide chars and they are a c++11 features.

http://reviews.llvm.org/D6352

Files:
  lib/msan/msan_interceptors.cc
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