Introduce number type information in the virtual frame.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
===================================================================
--- src/ia32/macro-assembler-ia32.cc	(revision 3859)
+++ src/ia32/macro-assembler-ia32.cc	(working copy)
@@ -383,6 +383,17 @@
 }
 
 
+void MacroAssembler::AbortIfNotNumber(Register object, const char* msg) {
+  Label ok;
+  test(object, Immediate(kSmiTagMask));
+  j(zero, &ok);
+  cmp(FieldOperand(object, HeapObject::kMapOffset),
+      Factory::heap_number_map());
+  Assert(equal, msg);
+  bind(&ok);
+}
+
+
 void MacroAssembler::EnterFrame(StackFrame::Type type) {
   push(ebp);
   mov(ebp, Operand(esp));