X87: [turbofan] Fewer gap moves for tail calls.

  port 51e992f1 (r32410)

  original commit message:
  Restore frame pointer directly from stack rather than copying it and
  restoring. Also restore return address register directly on platforms that
  support it.

BUG=

Review URL: https://codereview.chromium.org/1483063004

Cr-Commit-Position: refs/heads/master@{#32440}

src/compiler/x87/code-generator-x87.cc

@@ -341,9 +341,6 @@ void CodeGenerator::AssembleDeconstructActivationRecord(int stack_param_delta) {
   if (sp_slot_delta > 0) {
     __ add(esp, Immediate(sp_slot_delta * kPointerSize));
   }
-  if (frame()->needs_frame()) {
-    __ pop(ebp);
-  }
   frame_access_state()->SetFrameAccessToDefault();
 }
 
@@ -354,6 +351,9 @@ void CodeGenerator::AssemblePrepareTailCall(int stack_param_delta) {
     __ sub(esp, Immediate(-sp_slot_delta * kPointerSize));
     frame_access_state()->IncreaseSPDelta(-sp_slot_delta);
   }
+  if (frame()->needs_frame()) {
+    __ mov(ebp, MemOperand(ebp, 0));
+  }
   frame_access_state()->SetFrameAccessToSP();
 }