https://bugs.webkit.org/show_bug.cgi?id=115926

Reviewed by Mark Hahnenberg.

This node exists mainly to help the DFG see that a node may have both an int
and a double representation. But in the FTL, nodes already have multiple
representations. So this is just a no-op for the FTL.

I considered making it so that the node isn't even inserted if we're doing
FTL compilation, but that would have required a bunch of conditionalizing in
the DFG's optimization phases, which sort of expect this node to be present
and necessary.

* ftl/FTLCapabilities.cpp:
(JSC::FTL::canCompile):
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::LowerDFGToLLVM::compileNode):
(JSC::FTL::LowerDFGToLLVM::compileInt32ToDouble):
(LowerDFGToLLVM):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153152 268f45cc-cd09-0410-ab3c-d52691b4dbfc