[PATCH] [msan] Mark one test as only supported on x86

[Alexey Samsonov]

LGTM


================
Comment at: test/msan/vector_cvt.cc:3
@@ -2,2 +2,3 @@
 // RUN: %clangxx_msan -DPOSITIVE -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s
+// REQUIRES: x86_64-supported-target,i386-supported-target
 
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Just `x86_64-supported-target`. Looks like we only run MSan tests in 64-bit mode.

http://reviews.llvm.org/D10652

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