re PR rtl-optimization/48542 (unchanged variables in code which calls setjmp may be clobbered (including the return-address))

	PR rtl-optimization/48542
	* reload.c (find_equiv_reg): Stop looking when finding a
	setjmp-type call.
	* reload1.c (reload_as_needed): Invalidate all reload
	registers when crossing a setjmp-type call.

From-SVN: r175132