Merged r16772, r18000, r18030, r18298, r18319 into 3.21 branch.

src/arguments.h

Index: src/arguments.h
diff --git a/src/arguments.h b/src/arguments.h
index c1db98b53dbf6583190889b729fce0db4ff17823..f5e4eb0cffa2f327e9f4b2f3c585f0e598aed114 100644
--- a/src/arguments.h
+++ b/src/arguments.h
@@ -281,12 +281,23 @@ class FunctionCallbackArguments
 };
 
 
+double ClobberDoubleRegisters(double x1, double x2, double x3, double x4);
+
+
+#ifdef DEBUG
+#define CLOBBER_DOUBLE_REGISTERS() ClobberDoubleRegisters(1, 2, 3, 4);
+#else
+#define CLOBBER_DOUBLE_REGISTERS()
+#endif
+
+
 #define DECLARE_RUNTIME_FUNCTION(Type, Name)    \
 Type Name(int args_length, Object** args_object, Isolate* isolate)
 
 #define RUNTIME_FUNCTION(Type, Name)                                  \
 static Type __RT_impl_##Name(Arguments args, Isolate* isolate);       \
 Type Name(int args_length, Object** args_object, Isolate* isolate) {  \
+  CLOBBER_DOUBLE_REGISTERS();                                         \
   Arguments args(args_length, args_object);                           \
   return __RT_impl_##Name(args, isolate);                             \
 }                                                                     \