[turbofan] Fewer gap moves for tail calls

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index b69ddd5798ffe712ae94686e5bdc228a4a3c6756..a96f969d0bbeaf80d6e45975be627da1cc3f1ebd 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -578,9 +578,6 @@ void CodeGenerator::AssembleDeconstructActivationRecord(int stack_param_delta) {
   if (sp_slot_delta > 0) {
     __ addq(rsp, Immediate(sp_slot_delta * kPointerSize));
   }
-  if (frame()->needs_frame()) {
-    __ popq(rbp);
-  }
   frame_access_state()->SetFrameAccessToDefault();
 }
 
@@ -591,6 +588,9 @@ void CodeGenerator::AssemblePrepareTailCall(int stack_param_delta) {
     __ subq(rsp, Immediate(-sp_slot_delta * kPointerSize));
     frame_access_state()->IncreaseSPDelta(-sp_slot_delta);
   }
+  if (frame()->needs_frame()) {
+    __ movq(rbp, MemOperand(rbp, 0));
+  }
   frame_access_state()->SetFrameAccessToSP();
 }