[cleanup] Remove empty simulators for ia32 and x64

No need for empty header files and empty implementation files (which
will be compiled even though they are empty).

R=ishell@chromium.org

Bug: v8:8562
Change-Id: Icd54b0cab7dba991d11c26262deb2b034f67869e
Reviewed-on: https://chromium-review.googlesource.com/c/1384305Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58366}

BUILD.gn

@@ -2815,8 +2815,6 @@ v8_source_set("v8_base") {
       "src/ia32/macro-assembler-ia32.cc",
       "src/ia32/macro-assembler-ia32.h",
       "src/ia32/register-ia32.h",
-      "src/ia32/simulator-ia32.cc",
-      "src/ia32/simulator-ia32.h",
       "src/ia32/sse-instr.h",
       "src/regexp/ia32/regexp-macro-assembler-ia32.cc",
       "src/regexp/ia32/regexp-macro-assembler-ia32.h",
@@ -2850,8 +2848,6 @@ v8_source_set("v8_base") {
       "src/x64/macro-assembler-x64.cc",
       "src/x64/macro-assembler-x64.h",
       "src/x64/register-x64.h",
-      "src/x64/simulator-x64.cc",
-      "src/x64/simulator-x64.h",
       "src/x64/sse-instr.h",
     ]
     if (is_linux || is_mac) {

src/ia32/simulator-ia32.cc

-// Copyright 2008 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.
-
-#include "src/ia32/simulator-ia32.h"
-
-// Since there is no simulator for the ia32 architecture this file is empty.

src/ia32/simulator-ia32.h

-// Copyright 2012 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.
-
-#ifndef V8_IA32_SIMULATOR_IA32_H_
-#define V8_IA32_SIMULATOR_IA32_H_
-
-// Since there is no simulator for the ia32 architecture this file is empty.
-
-#endif  // V8_IA32_SIMULATOR_IA32_H_

src/simulator.h

@@ -12,10 +12,8 @@
 #include "src/utils.h"
 #endif
 
-#if V8_TARGET_ARCH_IA32
-#include "src/ia32/simulator-ia32.h"
-#elif V8_TARGET_ARCH_X64
-#include "src/x64/simulator-x64.h"
+#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
+// No simulator for ia32 or x64.
 #elif V8_TARGET_ARCH_ARM64
 #include "src/arm64/simulator-arm64.h"
 #elif V8_TARGET_ARCH_ARM

src/x64/simulator-x64.cc

-// Copyright 2009 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.
-
-#include "src/x64/simulator-x64.h"
-
-// Since there is no simulator for the x64 architecture this file is empty.

src/x64/simulator-x64.h

-// Copyright 2012 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.
-
-#ifndef V8_X64_SIMULATOR_X64_H_
-#define V8_X64_SIMULATOR_X64_H_
-
-// Since there is no simulator for the x64 architecture this file is empty.
-
-#endif  // V8_X64_SIMULATOR_X64_H_