PowerPC NCG: support conditional branches outside +-32KB
Work around the PowerPC architecture's +-32KB limitation for conditional branches by conditionally skipping an unconditional branch instead (unconditional branches have a +-32MB range). This requires an extra pass over the basic blocks for each CmmTop after block sequencing, to determine which branches are "far". Fixes ticket #709, "Fixup too large" error with -fasm on PowerPC
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