[asan] port r196375 to 3.4

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/release_34@196478 91177308-0d34-0410-b5e6-96231b3b80d8
Merging r196501:
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r196501 | samsonov | 2013-12-05 16:53:36 +0400 (Thu, 05 Dec 2013) | 1 line

Run TSan/MSan lit tests only on 64-bit platforms
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git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/release_34@196502 91177308-0d34-0410-b5e6-96231b3b80d8