re PR rtl-optimization/87761 ([MIPS] New FAIL: gcc.target/mips/fix-r4000-10.c ...

re PR rtl-optimization/87761 ([MIPS] New FAIL: gcc.target/mips/fix-r4000-10.c   -O1 start with r265398)

	PR rtl-optimization/87761
	PR rtl-optimization/89826
	* regcprop.c (copyprop_hardreg_forward_1): Move may_trap_p test
	slightly later.
	(pass_cprop_hardreg::execute): Call df_analyze after adding the
	note problem to get REG_DEAD/REG_UNUSED notes updated.

	PR rtl-optimization/87761
	PR rtl-optimization/89826
	* gcc.c-torture/execute/pr89826.c: New test.

From-SVN: r269967