PR69195, Reload confused by invalid reg_equiv

PR69195, Reload confused by invalid reg_equiv

Optimizing indirect jumps to direct jumps, and deleting dead insns can
lead to changes in register lifetimes, which in turn can result in bad
reg_equiv info being passed to reload.  So do these tasks before
calculating reg_equiv info.

gcc/
	PR rtl-optimization/69195
	PR rtl-optimization/47992
	* ira.c (recorded_label_ref): Delete.
	(update_equiv_regs): Return void.
	(indirect_jump_optimize): New function.
	(ira): Call indirect_jump_optimize and delete_trivially_dead_insns
	before regstat_compute_ri.  Don't rebuild_jump_labels here.
	Delete update_regstat.
gcc/testsuite/
	* gcc.dg/pr69195.c: New.
	* gcc.dg/pr69238.c: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@234101 138bc75d-0d04-0410-961f-82ee72b054a4