https://bugs.webkit.org/show_bug.cgi?id=117905

Source/JavaScriptCore:

Reviewed by Geoffrey Garen.

Adds MakeRope to the CSE phase and removes the comment that says that
we could do it but aren't doing it.

Also fixed SpeculatedType dumping so that if you have a Cell type then
it just prints "Cell" and if you just have Object then it just prints
"Object", instead of printing the long list of types.

* bytecode/SpeculatedType.cpp:
(JSC::dumpSpeculation):
* dfg/DFGCSEPhase.cpp:
(JSC::DFG::CSEPhase::performNodeCSE):

LayoutTests:

Reviewed by Geoffrey Garen.

This benchmark speeds up by 50%.

* fast/js/regress/make-rope-cse-expected.txt: Added.
* fast/js/regress/make-rope-cse.html: Added.
* fast/js/regress/script-tests/make-rope-cse.js: Added.
(foo):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153242 268f45cc-cd09-0410-ab3c-d52691b4dbfc