Support all fast elements kinds in the major array operations.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 129bd95466520ef87de7bc6e7c5ac61234cd9f48..7166da44cc7e519b3efb652bcf52d26da2c590c7 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -3789,8 +3789,10 @@ Expression* Parser::ParseArrayLiteral(bool* ok) {
   // Very small array literals that don't have a concrete hint about their type

[danno, 2012/11/13 22:05:12]

Remove all the code from this line (beginning of comment)

[Toon Verwaest, 2012/11/14 11:53:13]

Done.

   // from a constant value should default to the slow case to avoid lots of
   // elements transitions on really small objects.
-  if (has_only_undefined_values && values->length() <= 2) {
-    elements_kind = FAST_ELEMENTS;
+  if (has_only_undefined_values &&
+      values->length() <= 2 &&
+      values->length() > 0) {
+    // elements_kind = FAST_ELEMENTS;
   }

[danno, 2012/11/13 22:05:12]

... to here.

[Toon Verwaest, 2012/11/14 11:53:13]

Done.

 
   // Simple and shallow arrays can be lazily copied, we transform the