PR c++/12175
	* varasm.c (notice_global_symbol): Discard external symbols.

	PR optimization/12286
	* gcov-io.c (gcov_read_words): Fix memmove call.
	* profile.c (compute_branch_probabilities): Add extra sanity checks.

	PR C++/12047
	* except.c (build_eh_type_type): Call mark_used on the type.

From-SVN: r71916