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add dbgcnt and opt-info support for devirtualization


Hi, debugging runtime bugs due to devirtualization can be hard for
very large C++ programs with complicated class hierarchy. This patch
adds the support to report this high level transformation via
-fopt-info (not hidden inside dump file) and the ability the do binary
search with cutoff.

Ok for trunk after build and test?

thanks,

David

Attachment: devirt_debug_trunk.txt
Description: Text document


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