[stubs] Simplify the non-function case of CallConstructStub.

src/full-codegen/arm64/full-codegen-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/compiler.h"
@@ skipping 2892 matching lines @@
     DCHECK(expr->AllocationSiteFeedbackSlot().ToInt() ==
            expr->CallNewFeedbackSlot().ToInt() + 1);
   }
 
   __ LoadObject(x2, FeedbackVector());
   __ Mov(x3, SmiFromSlot(expr->CallNewFeedbackSlot()));
 
   CallConstructStub stub(isolate(), RECORD_CONSTRUCTOR_TARGET);
   __ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
   PrepareForBailoutForId(expr->ReturnId(), TOS_REG);
+  // Restore context register.
+  __ Ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
   context()->Plug(x0);
 }
 
 
 void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
   SuperCallReference* super_call_ref =
       expr->expression()->AsSuperCallReference();
   DCHECK_NOT_NULL(super_call_ref);
 
   EmitLoadSuperConstructor(super_call_ref);
@@ skipping 29 matching lines @@
   }
 
   __ LoadObject(x2, FeedbackVector());
   __ Mov(x3, SmiFromSlot(expr->CallFeedbackSlot()));
 
   CallConstructStub stub(isolate(), SUPER_CALL_RECORD_TARGET);
   __ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
 
   RecordJSReturnSite(expr);
 
+  // Restore context register.
+  __ Ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
   context()->Plug(x0);
 }
 
 
 void FullCodeGenerator::EmitIsSmi(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);
 
   VisitForAccumulatorValue(args->at(0));
 
@@ skipping 904 matching lines @@
     __ Cbnz(x1, &loop);
   }
 
   __ bind(&args_set_up);
   __ Peek(x1, Operand(x0, LSL, kPointerSizeLog2));
   __ LoadRoot(x2, Heap::kUndefinedValueRootIndex);
 
   CallConstructStub stub(isolate(), SUPER_CONSTRUCTOR_CALL);
   __ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
 
-  __ Drop(1);
+  // Restore context register.
+  __ Ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
 
-  context()->Plug(result_register());
+  context()->DropAndPlug(1, x0);
 }
 
 
 void FullCodeGenerator::EmitRegExpConstructResult(CallRuntime* expr) {
   RegExpConstructResultStub stub(isolate());
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 3);
   VisitForStackValue(args->at(0));
   VisitForStackValue(args->at(1));
   VisitForAccumulatorValue(args->at(2));
@@ skipping 1462 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64