Introduce PushQuad and PopQuad for x64 port.

src/x64/frames-x64.h

Index: src/x64/frames-x64.h
diff --git a/src/x64/frames-x64.h b/src/x64/frames-x64.h
index 0faa3497ece68f652b74b4506330b77b0e19c218..b988c534623322577ec384c9b7b53e01ed0d268d 100644
--- a/src/x64/frames-x64.h
+++ b/src/x64/frames-x64.h
@@ -133,6 +133,10 @@ inline Object* JavaScriptFrame::function_slot_object() const {
 
 
 inline void StackHandler::SetFp(Address slot, Address fp) {
+  if (kFPOnStackSize == 2 * kPointerSize) {
+    // Zero out the high-32 bit of FP for x32 port.
+    Memory::Address_at(slot + kPointerSize) = 0;
+  }
   Memory::Address_at(slot) = fp;
 }