PPC/e500: Fix lj_vm_floor() for inf/nan.

src/vm_ppcspe.dasc

@@ -2038,6 +2038,7 @@ static void build_subroutines(BuildCtx *ctx)
   |
   |->vm_floor:
   |  mflr CARG3
+  |  evmergelo CARG2, CARG1, CARG2
   |  bl ->vm_floor_hilo
   |  mtlr CARG3
   |  evmergehi CRET1, CRET2, CRET2