rs6000: Make lround<mode>di2 depend on TARGET_FPRND (PR86684)

TARGET_FPRND should be on for everything ISA 2.04 and later, and
TARGET_VSX implies ISA 2.06 or later; but it is possible to disable
TARGET_FPRND (separately via -mno-fprnd, but also implicitly)
currently, and then things fall down.  This patch makes things not
fall down.


	PR target/86684
	PR target/87149
	* config/rs6000/rs6000.md (lround<mode>di2): Gate on TARGET_FPRND.

From-SVN: r264011

gcc/ChangeLog

+2018-08-31  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/86684
+	PR target/87149
+	* config/rs6000/rs6000.md (lround<mode>di2): Gate on TARGET_FPRND.
+
 2018-08-31  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/87138

gcc/config/rs6000/rs6000.md

@@ -5985,7 +5985,7 @@
    (set (match_operand:DI 0 "gpc_reg_operand")
 	(unspec:DI [(match_dup 2)]
 		   UNSPEC_FCTID))]
-  "TARGET_HARD_FLOAT && TARGET_VSX"
+  "TARGET_HARD_FLOAT && TARGET_VSX && TARGET_FPRND"
 {
   operands[2] = gen_reg_rtx (<MODE>mode);
 })