Simple enhancement to -dA dump

[Xinliang David Li]

For an assembly dump, it is very useful to examine the control flow
graph with frequency and profile count information. This requires
dumping the .s file with more control flow annotations. This patch
does just that. The format of the annotation is the same as gimple
basic block dump with -fdump-tree-xxx-blocks so the same
post-processing tools can be shared to generate the .dot file. To see
bb layout, the BB sequence number is also dumped.

Bootstrapped on x86-64/linux. Regression test is on going.

Ok for checkin?

Thanks,
David


2011-04-03  Xinliang David Li  <davidxl@google.com>

        * final.c (dump_basic_block_info): New function.
        (final): Dump basic block.
        (final_scan_insn): Remove old dump.
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