[turbofan] Fewer gap moves for tail calls

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

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index fd593efbd2310bab2efeca1bfa44dd44043d71a3..8fc4ac8cffc75125c9847e559a19f01554bc5e59 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -359,13 +359,6 @@ void CodeGenerator::AssembleDeconstructActivationRecord(int stack_param_delta) {
   if (sp_slot_delta > 0) {
     __ add(sp, sp, Operand(sp_slot_delta * kPointerSize));
   }
-  if (frame()->needs_frame()) {
-    if (FLAG_enable_embedded_constant_pool) {
-      __ ldm(ia_w, sp, pp.bit() | fp.bit() | lr.bit());
-    } else {
-      __ ldm(ia_w, sp, fp.bit() | lr.bit());
-    }
-  }
   frame_access_state()->SetFrameAccessToDefault();
 }
 
@@ -376,6 +369,13 @@ void CodeGenerator::AssemblePrepareTailCall(int stack_param_delta) {
     __ sub(sp, sp, Operand(-sp_slot_delta * kPointerSize));
     frame_access_state()->IncreaseSPDelta(-sp_slot_delta);
   }
+  if (frame()->needs_frame()) {
+    if (FLAG_enable_embedded_constant_pool) {
+      __ ldr(cp, MemOperand(fp, StandardFrameConstants::kConstantPoolOffset));
+    }
+    __ ldr(lr, MemOperand(fp, StandardFrameConstants::kCallerPCOffset));
+    __ ldr(fp, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  }
   frame_access_state()->SetFrameAccessToSP();
 }