rs6000: Fix absif2

Without this patch absif2 always FAILs.  There is no testcase for
that, nor do we see it during bootstrap, but it is obvious.


	* config/rs6000/rs6000.md (abs<mode>2 for FLOAT128): Handle IFmode.

From-SVN: r261158

gcc/ChangeLog

+2018-06-04  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config/rs6000/rs6000.md (abs<mode>2 for FLOAT128): Handle IFmode.
+
 2018-06-04  Richard Sandiford  <richard.sandiford@linaro.org>
 
 	* expr.c (expand_expr_real_1): Force the operand into memory if

gcc/config/rs6000/rs6000.md

@@ -7980,7 +7980,7 @@
   label = gen_label_rtx ();
   if (<MODE>mode == TFmode)
     emit_insn (gen_abstf2_internal (operands[0], operands[1], label));
-  else if (<MODE>mode == TFmode)
+  else if (<MODE>mode == IFmode)
     emit_insn (gen_absif2_internal (operands[0], operands[1], label));
   else
     FAIL;