[Darwin, PPC, testsuite] Skip tests for unimplemented functionality.

The -mno-speculate-indirect-jumps functionality is not implemented for
Darwin and, given that it's deprecated, is unlikely to be.

2019-06-24  Iain Sandoe  <iain@sandoe.co.uk>

	* gcc.target/powerpc/safe-indirect-jump-1.c: Skip for Darwin.
	* gcc.target/powerpc/safe-indirect-jump-7.c: Likewise.

From-SVN: r272627

gcc/testsuite/ChangeLog

 2019-06-24  Iain Sandoe  <iain@sandoe.co.uk>
 
+	* gcc.target/powerpc/safe-indirect-jump-1.c: Skip for Darwin.
+	* gcc.target/powerpc/safe-indirect-jump-7.c: Likewise.
+
+2019-06-24  Iain Sandoe  <iain@sandoe.co.uk>
+
 	* gcc.target/powerpc/spec-barr-1.c: Adjust scan assembler regex
 	to recognise Darwin's register names.
 

gcc/testsuite/gcc.target/powerpc/safe-indirect-jump-1.c

 /* { dg-do compile } */
+/* { dg-skip-if "not implemented for Darwin" { powerpc*-*-darwin* } } */
 /* { dg-additional-options "-mno-speculate-indirect-jumps" } */
 /* { dg-warning "'-mno-speculate-indirect-jumps' is deprecated" "" { target *-*-* } 0 } */
 

gcc/testsuite/gcc.target/powerpc/safe-indirect-jump-7.c

 /* { dg-do compile } */
+/* { dg-skip-if "not implemented for Darwin" { powerpc*-*-darwin* } } */
 /* { dg-additional-options "-mno-speculate-indirect-jumps" } */
 /* { dg-warning "'-mno-speculate-indirect-jumps' is deprecated" "" { target *-*-* } 0 } */