Suppress massive prefetching of unaddressable memory in v8::internal::OS::MemCopy

tools/valgrind/drmemory/suppressions.txt

 # This file contains suppressions for the Dr.Memory tool, see
 # http://dev.chromium.org/developers/how-tos/using-drmemory
 #
 # This file contains suppressions for the DrMemory reports happening
 # in the 'light' mode (a.k.a. drmemory_light) as well as in the 'full' mode.
 # Please use suppressions_full.txt for all the reports that can happen only
 # in the full mode (drmemory_full),
 
 ############################
 # Known reports on the third party we have no control over.
@@ skipping 107 matching lines @@
 *!std::numpunct<*>::_Tidy
 *!std::numpunct<*>::~numpunct<*>
 
 # TODO(rbultje): Investigate if code fix is required instead. 
 WARNING
 name=http://crbug.com/223255 - prefetches in vp8
 instruction=prefetch*
 ffmpegsumo.dll!ff_prefetch_mmxext
 ffmpegsumo.dll!vp8_decode_mb_row_no_filter
 
+WARNING
+name=http://crbug.com/233500 - prefetches in v8::internal::OS::MemCopy
+instruction=prefetch*
+v8.dll!v8::internal::OS::MemCopy
+
 ############################
 # Intentional errors in Chromium tests (ToolsSanityTests)
 LEAK
 name=sanity test 01 (memory leak)
 base_unittests.exe!operator new
 base_unittests.exe!operator new[]
 base_unittests.exe!base::ToolsSanityTest_MemoryLeak_Test::TestBody
 
 # "..." is needed due to http://code.google.com/p/drmemory/issues/detail?id=666
 UNADDRESSABLE ACCESS
@@ skipping 293 matching lines @@
 WARNING
 name=http://crbug.com/222628
 ...
 v8.dll!v8::internal::CopyBytes<unsigned char>
 v8.dll!v8::internal::Code::CopyFrom
 v8.dll!v8::internal::Heap::CreateCode
 v8.dll!v8::internal::Factory::NewCode
 v8.dll!v8::internal::CodeGenerator::MakeCodeEpilogue
 v8.dll!v8::internal::FullCodeGenerator::MakeCode
 v8.dll!v8::internal::GenerateCode