analyzer: fix ICE on casting float to pointer [PR96764]

analyzer: fix ICE on casting float to pointer [PR96764]

gcc/analyzer/ChangeLog:
	PR analyzer/96764
	* region-model-manager.cc
	(region_model_manager::maybe_fold_unaryop): Handle VIEW_CONVERT_EXPR.
	(region_model_manager::get_or_create_cast): Move logic for
	real->integer casting to...
	(get_code_for_cast): ...this new function, and add logic for
	real->non-integer casts.
	(region_model_manager::maybe_fold_sub_svalue): Handle
	VIEW_CONVERT_EXPR.
	* region-model.cc
	(region_model::add_any_constraints_from_gassign): Likewise.
	* svalue.cc (svalue::maybe_undo_cast): Likewise.
	(unaryop_svalue::dump_to_pp): Likewise.

gcc/testsuite/ChangeLog:
	PR analyzer/96764
	* gcc.dg/analyzer/pr96764.c: New test.