OS::MemMove/OS::MemCopy: Don't call through to generated code when size == 0 to avoid prefetching i…

src/ia32/codegen-ia32.cc

Index: src/ia32/codegen-ia32.cc
diff --git a/src/ia32/codegen-ia32.cc b/src/ia32/codegen-ia32.cc
index caf808b953731c2a3adbfd56fe3cbf4ca9386526..7663c6a7fd37bd58b466a68db8b4eb86cc436cbc 100644
--- a/src/ia32/codegen-ia32.cc
+++ b/src/ia32/codegen-ia32.cc
@@ -635,6 +635,8 @@ OS::MemMoveFunction CreateMemMoveFunction() {
   ASSERT(!RelocInfo::RequiresRelocation(desc));
   CPU::FlushICache(buffer, actual_size);
   OS::ProtectCode(buffer, actual_size);
+  // TODO(jkummerow): It would be nice to register this code creation event
+  // with the PROFILE / GDBJIT system.
   return FUNCTION_CAST<OS::MemMoveFunction>(buffer);
 }