[PATCH] MSan: Use `createSanitizerCtor` to create ctor, and call `__msan_init`

[Alexey Samsonov]

LGTM


================
Comment at: test/Instrumentation/MemorySanitizer/msan_basic.ll:881
@@ +880,3 @@
+
+; CHECK: define internal void @msan.module_ctor
+; CHECK: call void @__msan_init()
----------------
CHECK-LABEL

http://reviews.llvm.org/D8781

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