[Darwin, PPC, testsuite] Fix builtins-1 testcase for Darwin.

This needs to account for Darwin's __USER_LABEL_PREFIX__.

2019-06-23  Iain Sandoe  <iain@sandoe.co.uk>

	* gcc.target/powerpc/builtins-1.c: Account for Darwin's use of
	__USER_LABEL_PREFIX__.

From-SVN: r272604

gcc/testsuite/ChangeLog

 2019-06-23  Iain Sandoe  <iain@sandoe.co.uk>
 
+	* gcc.target/powerpc/builtins-1.c: Account for Darwin's use of
+	__USER_LABEL_PREFIX__.
+
+2019-06-23  Iain Sandoe  <iain@sandoe.co.uk>
+
 	* gcc.target/powerpc/pr71785.c: For Darwin, make test non-PIC,
 	expect the out-of-line GPR restore, and test specifically for
 	absence of branches to local labels.

gcc/testsuite/gcc.target/powerpc/builtins-1.c

@@ -330,10 +330,10 @@ int main ()
 /* { dg-final { scan-assembler-times "divd" 8  { target lp64 } } } */
 /* { dg-final { scan-assembler-times "divdu" 2  { target lp64 } } } */
 /* { dg-final { scan-assembler-times "mulld" 4  { target lp64 } } } */
-/* check for both .__divdi3 (AIX) and __divdi3 (Linux) */
-/* { dg-final { scan-assembler-times {\mbl \.?__divdi3\M} 2   { target { ilp32 } } } } */
-/* check for both .__udivdi3 (AIX) and __udivdi3 (Linux) */
-/* { dg-final { scan-assembler-times {\mbl \.?__udivdi3\M} 2  { target { ilp32 } } } } */
+/* check for .__divdi3 (AIX), __divdi3 (Linux) and ___divdi3 (Darwin) */
+/* { dg-final { scan-assembler-times {\mbl \.?_?__divdi3\M} 2   { target { ilp32 } } } } */
+/* check for both .__udivdi3 (AIX), __udivdi3 (Linux) and ___udivdi3 (Darwin) */
+/* { dg-final { scan-assembler-times {\mbl \.?_?__udivdi3\M} 2  { target { ilp32 } } } } */
 /* { dg-final { scan-assembler-times "mullw" 12  { target ilp32 } } } */
 /* { dg-final { scan-assembler-times "mulhwu" 4  { target ilp32 } } } */
 /* { dg-final { scan-assembler-times "xxmrgld" 0 } } */