PR c++/80544 strip cv-quals from cast results

gcc/cp:

	PR c++/80544
	* tree.c (reshape_init): Use unqualified type for direct enum init.
	* typeck.c (maybe_warn_about_cast_ignoring_quals): New.
	(build_static_cast_1, build_reinterpret_cast_1): Strip cv-quals from
	non-class destination types.
	(build_const_cast_1): Strip cv-quals from destination types.
	(build_static_cast, build_reinterpret_cast, build_const_cast)
	(cp_build_c_cast): Add calls to maybe_warn_about_cast_ignoring_quals.

gcc/testsuite:

	PR c++/80544
	* g++.dg/expr/cast11.C: New test.

From-SVN: r248432