[interpreter] Move temporary register allocator into own file.

test/cctest/compiler/test-run-bytecode-graph-builder.cc

 // Copyright 2015 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 <utility>
 
 #include "src/compiler/pipeline.h"
 #include "src/execution.h"
 #include "src/handles.h"
 #include "src/interpreter/bytecode-array-builder.h"
@@ skipping 2541 matching lines @@
 
     BytecodeGraphTester tester(isolate, zone, script.start());
     auto callable = tester.GetCallable<>();
     Handle<Object> return_value = callable().ToHandleChecked();
     CHECK(return_value->SameValue(*snippets[i].return_value()));
   }
 }
 
 
 TEST(JumpWithConstantsAndWideConstants) {
-  HandleAndZoneScope scope;
-  auto isolate = scope.main_isolate();
   const int kStep = 19;
   int start = 7;
   for (int constants = start; constants < 256 + 3 * kStep; constants += kStep) {
     std::stringstream filler_os;
     // Generate a string that consumes constant pool entries and
     // spread out branch distances in script below.
     for (int i = 0; i < constants; i++) {
       filler_os << "var x_ = 'x_" << i << "';\n";
     }
     std::string filler(filler_os.str());
 
     std::stringstream script_os;
     script_os << "function " << kFunctionName << "(a) {\n";
     script_os << "  " << filler;
     script_os << "  for (var i = a; i < 2; i++) {\n";
     script_os << "  " << filler;
     script_os << "    if (i == 0) { " << filler << "i = 10; continue; }\n";
     script_os << "    else if (i == a) { " << filler << "i = 12; break; }\n";
     script_os << "    else { " << filler << " }\n";
     script_os << "  }\n";
     script_os << "  return i;\n";
     script_os << "}\n";
     script_os << kFunctionName << "(0);\n";
     std::string script(script_os.str());
+
+    HandleAndZoneScope scope;
+    auto isolate = scope.main_isolate();
     auto factory = isolate->factory();
     auto zone = scope.main_zone();
     for (int a = 0; a < 3; a++) {
       BytecodeGraphTester tester(isolate, zone, script.c_str());
       auto callable = tester.GetCallable<Handle<Object>>();
       Handle<Object> return_val =
           callable(factory->NewNumberFromInt(a)).ToHandleChecked();
       static const int results[] = {11, 12, 2};
       CHECK_EQ(Handle<Smi>::cast(return_val)->value(), results[a]);
     }
@@ skipping 29 matching lines @@
     Handle<Object> return_value = callable().ToHandleChecked();
     CHECK(return_value->SameValue(*snippets[i].return_value()));
   }
 
   FLAG_harmony_do_expressions = old_flag;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8