Reintroduce Conditional (IfOp) using the new infrastructure, fix the Cmov support in the backend, use x86 cmov when possible, make it work with floating point comparison conditions, make MaterializeNode a subclass of Conditional, fix nasty bug related to introducing LIR jumps in an existing LIRBlock in MaterializeNode/Conditional Canonicalize FDConversionNode if input is constant

#!/bin/bash
pushd make
LANG=C ARCH_DATA_MODEL=64 HOTSPOT_BUILD_JOBS=16 make clean
popd