[compiler] Delay allocation of code-embedded heap numbers.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index 7087c0397368dbd309a647ee65cc9b1fd81e3b7c..471fa55cb0a02ec189669a845cb96b79de6ab9c2 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -2501,6 +2501,14 @@ void MacroAssembler::Move(Register dst, Register src) {
   }
 }
 
+void MacroAssembler::MoveNumber(Register dst, double value) {
+  int32_t smi;
+  if (DoubleToSmiInteger(value, &smi)) {
+    Move(dst, Smi::FromInt(smi));
+  } else {
+    movp_heap_number(dst, value);
+  }
+}
 
 void MacroAssembler::Move(Register dst, Handle<Object> source) {
   AllowDeferredHandleDereference smi_check;