Add initial support for compiler unit tests using GTest/GMock.

src/compiler/instruction-selector-impl.h

 // Copyright 2014 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_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_
 #define V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_
 
 #include "src/compiler/instruction.h"
 #include "src/compiler/instruction-selector.h"
 #include "src/compiler/linkage.h"
@@ skipping 127 matching lines @@
                                            Register::ToAllocationIndex(reg));
   }
 
   InstructionOperand* TempImmediate(int32_t imm) {
     int index = sequence()->AddImmediate(Constant(imm));
     return ImmediateOperand::Create(index, zone());
   }
 
   InstructionOperand* Label(BasicBlock* block) {
     // TODO(bmeurer): We misuse ImmediateOperand here.
-    return ImmediateOperand::Create(block->id(), zone());
+    return TempImmediate(block->id());
   }
 
  protected:
   Graph* graph() const { return selector()->graph(); }
   InstructionSelector* selector() const { return selector_; }
   InstructionSequence* sequence() const { return selector()->sequence(); }
   Isolate* isolate() const { return zone()->isolate(); }
   Zone* zone() const { return selector()->instruction_zone(); }
 
  private:
@@ skipping 203 matching lines @@
   int control_count() { return descriptor->CanLazilyDeoptimize() ? 2 : 0; }
 
   int fixed_and_control_count() { return fixed_count + control_count(); }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_