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

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

Index: src/full-codegen/arm64/full-codegen-arm64.cc
diff --git a/src/full-codegen/arm64/full-codegen-arm64.cc b/src/full-codegen/arm64/full-codegen-arm64.cc
index e460ac3220523de43e0792d03a4a7646a548bd2a..bcae5563e58f36c86b2e8006b6b82e3344a1a75d 100644
--- a/src/full-codegen/arm64/full-codegen-arm64.cc
+++ b/src/full-codegen/arm64/full-codegen-arm64.cc
@@ -2910,6 +2910,8 @@ void FullCodeGenerator::VisitCallNew(CallNew* expr) {
   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);
 }
 
@@ -2959,6 +2961,8 @@ void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
 
   RecordJSReturnSite(expr);
 
+  // Restore context register.
+  __ Ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
   context()->Plug(x0);
 }
 
@@ -3883,9 +3887,10 @@ void FullCodeGenerator::EmitDefaultConstructorCallSuper(CallRuntime* expr) {
   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);
 }