Replace OS::MemCopy with OS::MemMove (just as fast but more flexible).

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index bbea4d9dfb80efbfc5c3f5c1cb7ed56170f4d567..84478906919c07abcdc152eca18534a332168538 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -135,7 +135,7 @@ void LCodeGen::Comment(const char* format, ...) {
   // issues when the stack allocated buffer goes out of scope.
   size_t length = builder.position();
   Vector<char> copy = Vector<char>::New(length + 1);
-  memcpy(copy.start(), builder.Finalize(), copy.length());
+  OS::MemCopy(copy.start(), builder.Finalize(), copy.length());
   masm()->RecordComment(copy.start());
 }