[turbofan] Introduce an ExternalPointer type.

test/unittests/compiler/node-test-utils.cc

 // 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.
 
 #include "test/unittests/compiler/node-test-utils.h"
 
 #include <vector>
 
 #include "src/assembler.h"
 #include "src/compiler/common-operator.h"
@@ skipping 1772 matching lines @@
   return MakeMatcher(
       new IsConstantMatcher<double>(IrOpcode::kFloat64Constant, value_matcher));
 }
 
 
 Matcher<Node*> IsNumberConstant(const Matcher<double>& value_matcher) {
   return MakeMatcher(
       new IsConstantMatcher<double>(IrOpcode::kNumberConstant, value_matcher));
 }
 
+Matcher<Node*> IsPointerConstant(const Matcher<intptr_t>& value_matcher) {
+  return MakeMatcher(new IsConstantMatcher<intptr_t>(IrOpcode::kPointerConstant,
+                                                     value_matcher));
+}
 
 Matcher<Node*> IsSelect(const Matcher<MachineRepresentation>& type_matcher,
                         const Matcher<Node*>& value0_matcher,
                         const Matcher<Node*>& value1_matcher,
                         const Matcher<Node*>& value2_matcher) {
   return MakeMatcher(new IsSelectMatcher(type_matcher, value0_matcher,
                                          value1_matcher, value2_matcher));
 }
 
 
@@ skipping 576 matching lines @@
 IS_UNOP_MATCHER(StringFromCharCode)
 IS_UNOP_MATCHER(Word32Clz)
 IS_UNOP_MATCHER(Word32Ctz)
 IS_UNOP_MATCHER(Word32Popcnt)
 IS_UNOP_MATCHER(Word32ReverseBytes)
 #undef IS_UNOP_MATCHER
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8