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

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index f65b0c262331447971500f7988b6b91651ba4858..1d9d3ac93a5d563feec9386708b675627d13e865 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -4589,7 +4589,7 @@ HObjectAccess HObjectAccess::ForBackingStoreOffset(int offset,
 
 HObjectAccess HObjectAccess::ForField(Handle<Map> map, int index,
                                       Representation representation,
-                                      Handle<String> name) {
+                                      Handle<Name> name) {
   if (index < 0) {
     // Negative property indices are in-object properties, indexed
     // from the end of the fixed part of the object.