8280593: [PPC64, S390] redundant allocation of MacroAssembler in StubGenerator ctor

Backport-of: c936e7059b848d0e0be5f3234c4367657f2af2a7

Author: reinrich

src/hotspot/cpu/ppc/stubGenerator_ppc.cpp

@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2021 SAP SE. All rights reserved.
+ * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2022 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -4616,8 +4616,6 @@ class StubGenerator: public StubCodeGenerator {
 
  public:
   StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) {
-    // replace the standard masm with a special one:
-    _masm = new MacroAssembler(code);
     if (all) {
       generate_all();
     } else {

src/hotspot/cpu/s390/stubGenerator_s390.cpp

@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2016, 2019 SAP SE. All rights reserved.
+ * Copyright (c) 2016, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2022 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2404,9 +2404,6 @@ class StubGenerator: public StubCodeGenerator {
 
  public:
   StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) {
-    // Replace the standard masm with a special one:
-    _masm = new MacroAssembler(code);
-
     _stub_count = !all ? 0x100 : 0x200;
     if (all) {
       generate_all();

src/hotspot/share/runtime/stubCodeGenerator.cpp

@@ -69,7 +69,7 @@ void StubCodeDesc::print() const { print_on(tty); }
 // Implementation of StubCodeGenerator
 
 StubCodeGenerator::StubCodeGenerator(CodeBuffer* code, bool print_code) {
-  _masm = new MacroAssembler(code );
+  _masm = new MacroAssembler(code);
   _print_code = PrintStubCode || print_code;
 }