re PR tree-optimization/19121 (ICE: in merge_alias_info, at tree-ssa-copy.c:236)

re PR tree-optimization/19121 (ICE: in merge_alias_info, at tree-ssa-copy.c:236)

	PR tree-optimization/19121
	* tree-ssa-alias.c (compute_flow_sensitive_aliasing): When
	adding aliases to a name tag, also add them to the pointer's
	type tag.
	* tree-ssa-copy.c (merge_alias_info): Do not merge flow
	sensitive alias info at all.  Only check that the two pointers
	have compatible pointed-to sets.
	* tree-ssa.c (verify_name_tags): Verify that the alias set of
	a pointer's type tag is a superset of the alias set of the
	pointer's name tag.

testsuite/ChangeLog:

	PR tree-optimization/19121
	* gcc.c-torture/compile/pr19121.c: New test.

From-SVN: r93810