Suppress the ASan reports in swizzle_for_size()

third_party/mesa/MesaLib/src/mesa/program/ir_to_mesa.cpp

Index: third_party/mesa/MesaLib/src/mesa/program/ir_to_mesa.cpp
===================================================================
--- third_party/mesa/MesaLib/src/mesa/program/ir_to_mesa.cpp	(revision 148930)
+++ third_party/mesa/MesaLib/src/mesa/program/ir_to_mesa.cpp	(working copy)
@@ -56,6 +56,11 @@
 #include "program/prog_parameter.h"
 }
 
+#if defined(ADDRESS_SANITIZER)
+// Suppress AddressSanitizer reports about OOB reads in swizzle_for_size().
+// See also http://crbug.com/139772.
+__attribute__((no_address_safety_analysis))
+#endif
 static int swizzle_for_size(int size);
 
 /**