[PATCH] Fix PR 30562, remove unused variable is removing a referenced variable (in STORED_SYMS or LOADED_SYMS)

[Andrew Pinski]

Hi,
  Remove unused variables in tree-ssa-live.c can remove some actually
used variables because the use is hidden in STORED_SYMS and LOADED_SYMS,
both of which were added with the MEM-SSA merge.  So after we remove the
variables that are referenced in STORED_SYMS or LOADED_SYMS, we could
get an ICE.  This patch fixes the problem by marking the variables in
LOADED_SYMS and STORED_SYMS as being used.

OK?  Bootstrapped and tested on i686-linux-gnu with no regressions.

Thanks,
Andrew Pinski

ChangeLog:
	* tree-ssa-live.c (mark_all_vars_used): Mark the statement's
	LOADED_SYMS and STORED_SYMS's variables as used.
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