Add MachineSignature, which is an encapsulation of the machine types for parameters and return valu…

test/cctest/compiler/test-structured-machine-assembler.cc

Index: test/cctest/compiler/test-structured-machine-assembler.cc
diff --git a/test/cctest/compiler/test-structured-machine-assembler.cc b/test/cctest/compiler/test-structured-machine-assembler.cc
index 2ddd240b462829b57c8c61a6d8dd65d9173c5efa..eca07fa9db501afd79e1c3e38ea9a7f4884ada26 100644
--- a/test/cctest/compiler/test-structured-machine-assembler.cc
+++ b/test/cctest/compiler/test-structured-machine-assembler.cc
@@ -878,9 +878,8 @@ TEST(RunSimpleExpressionVariable1) {
 class QuicksortHelper : public StructuredMachineAssemblerTester<int32_t> {
  public:
   QuicksortHelper()
-      : StructuredMachineAssemblerTester<int32_t>(
-            MachineOperatorBuilder::pointer_rep(), kMachInt32,
-            MachineOperatorBuilder::pointer_rep(), kMachInt32),
+      : StructuredMachineAssemblerTester<int32_t>(kMachPtr, kMachInt32,
+                                                  kMachPtr, kMachInt32),
         input_(NULL),
         stack_limit_(NULL),
         one_(Int32Constant(1)),