DFG::SpeculativeJIT::compileInt32ToDouble() has an unnecessary case for constant operands
https://bugs.webkit.org/show_bug.cgi?id=110309

Reviewed by Sam Weinig.
        
It used to be necessary, back when we didn't have constant folding. Now we have
constant folding. So we don't need it.

* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileInt32ToDouble):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143562 268f45cc-cd09-0410-ab3c-d52691b4dbfc