32-bit build fix.

Unreviewed.

* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compilePeepHoleBooleanBranch): Explicitly
truncate to 32-bit to avoid compiler warnings. It's safe to truncate
because the payload of a boolean is the low bits on both 64-bit and 32-bit.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149050 268f45cc-cd09-0410-ab3c-d52691b4dbfc