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[google gcc-4_9] fix undefined references in debug_info


Hi,

This patch fixed a bug exposed in build kernel with fdo.

We cannot simply overwrite the bb footer in  emit_barrier_after_bb as
the bb may already have a footer (in this case, a deleted label stmt).
We need to output this label because it's a user label and debug_info
has a reference to it.

Tested with problematic file and regression test.
Trunk may also have the same issue, but I need to work on a testcase.

Thanks,

-Rong

Attachment: patch_diff.txt
Description: Text document


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