8340144: C1: remove unused Compilation::_max_spills

Reviewed-by: thartmann, shade

Author: D-D-H

src/hotspot/share/c1/c1_Compilation.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2024, Oracle and/or its affiliates. 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
@@ -274,8 +274,6 @@ void Compilation::emit_lir() {
     // Assign physical registers to LIR operands using a linear scan algorithm.
     allocator->do_linear_scan();
     CHECK_BAILOUT();
-
-    _max_spills = allocator->max_spills();
   }
 
   if (BailoutAfterLIR) {
@@ -568,7 +566,6 @@ Compilation::Compilation(AbstractCompiler* compiler, ciEnv* env, ciMethod* metho
 , _method(method)
 , _osr_bci(osr_bci)
 , _hir(nullptr)
-, _max_spills(-1)
 , _frame_map(nullptr)
 , _masm(nullptr)
 , _has_exception_handlers(false)

src/hotspot/share/c1/c1_Compilation.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2024, Oracle and/or its affiliates. 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
@@ -73,7 +73,6 @@ class Compilation: public StackObj {
   ciMethod*          _method;
   int                _osr_bci;
   IR*                _hir;
-  int                _max_spills;
   FrameMap*          _frame_map;
   C1_MacroAssembler* _masm;
   bool               _has_exception_handlers;
@@ -151,7 +150,6 @@ class Compilation: public StackObj {
   int osr_bci() const                            { return _osr_bci; }
   bool is_osr_compile() const                    { return osr_bci() >= 0; }
   IR* hir() const                                { return _hir; }
-  int max_spills() const                         { return _max_spills; }
   FrameMap* frame_map() const                    { return _frame_map; }
   CodeBuffer* code()                             { return &_code; }
   C1_MacroAssembler* masm() const                { return _masm; }