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

src/compiler/code-generator-impl.h

 // Copyright 2013 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_CODE_GENERATOR_IMPL_H_
 #define V8_COMPILER_CODE_GENERATOR_IMPL_H_
 
 #include "src/compiler/code-generator.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/generic-graph.h"
@@ skipping 47 matching lines @@
 
   Handle<HeapObject> InputHeapObject(int index) {
     return ToHeapObject(instr_->InputAt(index));
   }
 
   Label* InputLabel(int index) {
     return gen_->code()->GetLabel(InputBlock(index));
   }
 
   BasicBlock* InputBlock(int index) {
-    NodeId block_id = static_cast<NodeId>(instr_->InputAt(index)->index());
+    NodeId block_id = static_cast<NodeId>(InputInt32(index));
     // operand should be a block id.
     DCHECK(block_id >= 0);
     DCHECK(block_id < gen_->schedule()->BasicBlockCount());
     return gen_->schedule()->GetBlockById(block_id);
   }
 
   Register OutputRegister(int index = 0) {
     return ToRegister(instr_->OutputAt(index));
   }
 
@@ skipping 44 matching lines @@
 #if V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_ARM
   masm->CheckConstPool(true, false);
 #endif
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_GENERATOR_IMPL_H