[turbofan] Fewer gap moves for tail calls

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

Index: src/compiler/mips/code-generator-mips.cc
diff --git a/src/compiler/mips/code-generator-mips.cc b/src/compiler/mips/code-generator-mips.cc
index 71b32abb8a80369a648d59d38f0620e8b74685da..45ab52c54a8616ded9d5a492d4fc87f8cc58785e 100644
--- a/src/compiler/mips/code-generator-mips.cc
+++ b/src/compiler/mips/code-generator-mips.cc
@@ -467,9 +467,6 @@ void CodeGenerator::AssembleDeconstructActivationRecord(int stack_param_delta) {
   if (sp_slot_delta > 0) {
     __ addiu(sp, sp, sp_slot_delta * kPointerSize);
   }
-  if (frame()->needs_frame()) {
-    __ Pop(ra, fp);
-  }
   frame_access_state()->SetFrameAccessToDefault();
 }
 
@@ -480,6 +477,10 @@ void CodeGenerator::AssemblePrepareTailCall(int stack_param_delta) {
     __ Subu(sp, sp, Operand(-sp_slot_delta * kPointerSize));
     frame_access_state()->IncreaseSPDelta(-sp_slot_delta);
   }
+  if (frame()->needs_frame()) {
+    __ lw(ra, MemOperand(fp, StandardFrameConstants::kCallerPCOffset));
+    __ lw(fp, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  }
   frame_access_state()->SetFrameAccessToSP();
 }