Add missing ECF_NOTHROW flags to internal.def

This patch adds missing ECF_NOTHROW flags to the vectorisable
integer internal functions.

2017-08-17  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* internal-fn.def (CLRSB, CLZ, CTZ, FFS, PARITY, POPCOUNT): Add
	missing ECF_NOTHROW flags.

From-SVN: r251155

gcc/ChangeLog

+2017-08-17  Richard Sandiford  <richard.sandiford@linaro.org>
+
+	* internal-fn.def (CLRSB, CLZ, CTZ, FFS, PARITY, POPCOUNT): Add
+	missing ECF_NOTHROW flags.
+
 2017-08-17  Peter Bergner  <bergner@vnet.ibm.com>
 
 	PR target/72804

gcc/internal-fn.def

@@ -135,12 +135,12 @@ DEF_INTERNAL_OPTAB_FN (XORSIGN, ECF_CONST, xorsign, binary)
 DEF_INTERNAL_FLT_FN (LDEXP, ECF_CONST, ldexp, binary)
 
 /* Unary integer ops.  */
-DEF_INTERNAL_INT_FN (CLRSB, ECF_CONST, clrsb, unary)
-DEF_INTERNAL_INT_FN (CLZ, ECF_CONST, clz, unary)
-DEF_INTERNAL_INT_FN (CTZ, ECF_CONST, ctz, unary)
-DEF_INTERNAL_INT_FN (FFS, ECF_CONST, ffs, unary)
-DEF_INTERNAL_INT_FN (PARITY, ECF_CONST, parity, unary)
-DEF_INTERNAL_INT_FN (POPCOUNT, ECF_CONST, popcount, unary)
+DEF_INTERNAL_INT_FN (CLRSB, ECF_CONST | ECF_NOTHROW, clrsb, unary)
+DEF_INTERNAL_INT_FN (CLZ, ECF_CONST | ECF_NOTHROW, clz, unary)
+DEF_INTERNAL_INT_FN (CTZ, ECF_CONST | ECF_NOTHROW, ctz, unary)
+DEF_INTERNAL_INT_FN (FFS, ECF_CONST | ECF_NOTHROW, ffs, unary)
+DEF_INTERNAL_INT_FN (PARITY, ECF_CONST | ECF_NOTHROW, parity, unary)
+DEF_INTERNAL_INT_FN (POPCOUNT, ECF_CONST | ECF_NOTHROW, popcount, unary)
 
 DEF_INTERNAL_FN (GOMP_USE_SIMT, ECF_NOVOPS | ECF_LEAF | ECF_NOTHROW, NULL)
 DEF_INTERNAL_FN (GOMP_SIMT_ENTER, ECF_LEAF | ECF_NOTHROW, NULL)