[test] Move CodeAssembler tests to a separate file.

test/cctest/compiler/code-assembler-tester.h

Index: test/cctest/compiler/code-assembler-tester.h
diff --git a/test/cctest/compiler/code-assembler-tester.h b/test/cctest/compiler/code-assembler-tester.h
new file mode 100644
index 0000000000000000000000000000000000000000..609a137f8c588139d650ea4a14f9b4646700fe5e
--- /dev/null
+++ b/test/cctest/compiler/code-assembler-tester.h
@@ -0,0 +1,67 @@
+// Copyright 2016 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/handles.h"
+#include "src/interface-descriptors.h"
+#include "src/isolate.h"
+#include "test/cctest/compiler/function-tester.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+class ZoneHolder {
+ public:
+  explicit ZoneHolder(Isolate* isolate) : zone_(isolate->allocator()) {}
+  Zone* zone() { return &zone_; }
+
+ private:
+  Zone zone_;
+};
+
+// Inherit from ZoneHolder in order to create a zone that can be passed to
+// CodeAssembler base class constructor.
+template <typename CodeAssemblerT>
+class CodeAssemblerTesterImpl : private ZoneHolder, public CodeAssemblerT {
+ public:
+  // Test generating code for a stub.
+  CodeAssemblerTesterImpl(Isolate* isolate,
+                          const CallInterfaceDescriptor& descriptor)
+      : ZoneHolder(isolate),
+        CodeAssemblerT(isolate, ZoneHolder::zone(), descriptor,
+                       Code::ComputeFlags(Code::STUB), "test"),
+        scope_(isolate) {}
+
+  // Test generating code for a JS function (e.g. builtins).
+  CodeAssemblerTesterImpl(Isolate* isolate, int parameter_count)
+      : ZoneHolder(isolate),
+        CodeAssemblerT(isolate, ZoneHolder::zone(), parameter_count,
+                       Code::ComputeFlags(Code::FUNCTION), "test"),
+        scope_(isolate) {}
+
+  // This constructor is intended to be used for creating code objects with
+  // specific flags.
+  CodeAssemblerTesterImpl(Isolate* isolate, Code::Flags flags)
+      : ZoneHolder(isolate),
+        CodeAssemblerT(isolate, ZoneHolder::zone(), 0, flags, "test"),
+        scope_(isolate) {}
+
+  Handle<Code> GenerateCodeCloseAndEscape() {
+    return scope_.CloseAndEscape(CodeAssemblerT::GenerateCode());
+  }
+
+  // Expose some internal methods.
+
+  Node* SmiShiftBitsConstant() {
+    return CodeAssemblerT::SmiShiftBitsConstant();
+  }
+
+ private:
+  HandleScope scope_;
+  LocalContext context_;
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8