[crankshaft] Generalize PropertyAccessInfo to Name (so it can deal with symbols).

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 272bc5a554adb9f7e9e8185ffe0d38f71531a3f3..0b9ef425dc1ba694134a79bf62446ffc00a2bff4 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -2543,7 +2543,7 @@ class HOptimizedGraphBuilder : public HGraphBuilder, public AstVisitor {
    public:
     PropertyAccessInfo(HOptimizedGraphBuilder* builder,
                        PropertyAccessType access_type, Handle<Map> map,
-                       Handle<String> name)
+                       Handle<Name> name)
         : builder_(builder),
           access_type_(access_type),
           map_(map),
@@ -2569,7 +2569,7 @@ class HOptimizedGraphBuilder : public HGraphBuilder, public AstVisitor {
     bool NeedsWrappingFor(Handle<JSFunction> target) const;
 
     Handle<Map> map();
-    Handle<String> name() const { return name_; }
+    Handle<Name> name() const { return name_; }
 
     bool IsJSObjectFieldAccessor() {
       int offset;  // unused
@@ -2580,10 +2580,10 @@ class HOptimizedGraphBuilder : public HGraphBuilder, public AstVisitor {
       int offset;
       if (Accessors::IsJSObjectFieldAccessor(map_, name_, &offset)) {
         if (IsStringType()) {
-          DCHECK(String::Equals(isolate()->factory()->length_string(), name_));
+          DCHECK(Name::Equals(isolate()->factory()->length_string(), name_));
           *access = HObjectAccess::ForStringLength();
         } else if (IsArrayType()) {
-          DCHECK(String::Equals(isolate()->factory()->length_string(), name_));
+          DCHECK(Name::Equals(isolate()->factory()->length_string(), name_));
           *access = HObjectAccess::ForArrayLength(map_->elements_kind());
         } else {
           *access = HObjectAccess::ForMapAndOffset(map_, offset);
@@ -2716,7 +2716,7 @@ class HOptimizedGraphBuilder : public HGraphBuilder, public AstVisitor {
     HOptimizedGraphBuilder* builder_;
     PropertyAccessType access_type_;
     Handle<Map> map_;
-    Handle<String> name_;
+    Handle<Name> name_;
     Handle<JSObject> holder_;
     Handle<JSFunction> accessor_;
     Handle<JSObject> api_holder_;