A64: Synchronize with r16489.

src/ia32/assembler-ia32.h

Index: src/ia32/assembler-ia32.h
diff --git a/src/ia32/assembler-ia32.h b/src/ia32/assembler-ia32.h
index d6b6dab44c0ccfa854e03429fe88dda4ecace176..551d0311aad97c83eef4e49f08cc26e26130a8e6 100644
--- a/src/ia32/assembler-ia32.h
+++ b/src/ia32/assembler-ia32.h
@@ -183,6 +183,7 @@ const IntelDoubleRegister double_register_4 = { 4 };
 const IntelDoubleRegister double_register_5 = { 5 };
 const IntelDoubleRegister double_register_6 = { 6 };
 const IntelDoubleRegister double_register_7 = { 7 };
+const IntelDoubleRegister no_double_reg = { -1 };
 
 
 struct XMMRegister : IntelDoubleRegister {
@@ -227,6 +228,7 @@ struct XMMRegister : IntelDoubleRegister {
 #define xmm5 (static_cast<const XMMRegister&>(double_register_5))
 #define xmm6 (static_cast<const XMMRegister&>(double_register_6))
 #define xmm7 (static_cast<const XMMRegister&>(double_register_7))
+#define no_xmm_reg (static_cast<const XMMRegister&>(no_double_reg))
 
 
 struct X87Register : IntelDoubleRegister {