PowerPC local got test

This is the one that causes ld segfaults between 2019-10-04 and
2019-10-07.  Bug introduced with f749f26eea, fixed by 93370e8e7b.

	* testsuite/ld-powerpc/localgot.s,
	* testsuite/ld-powerpc/localgot.d: New test.
	* testsuite/ld-powerpc/powerpc.exp: Run it.

ld/ChangeLog

@@ -1,3 +1,9 @@
+2019-10-08  Alan Modra  <amodra@gmail.com>
+
+	* testsuite/ld-powerpc/localgot.s,
+	* testsuite/ld-powerpc/localgot.d: New test.
+	* testsuite/ld-powerpc/powerpc.exp: Run it.
+
 2019-10-07  Jozef Lawrynowicz  <jozef.l@mittosystems.com>
 
 	* testsuite/ld-msp430-elf/attr-gnu-main.s: New test.

ld/testsuite/ld-powerpc/localgot.d

@@ -0,0 +1,8 @@
+#source: localgot.s
+#as: -mppc64
+#ld: -pie
+#readelf: -r
+
+Relocation section '\.rela\.dyn' at offset .* contains 1 entry:
+ +Offset +Info +Type.*
+.*_RELATIVE .*

ld/testsuite/ld-powerpc/localgot.s

@@ -0,0 +1,5 @@
+ .text
+ .global _start
+_start:
+x:
+ ld 3,x@got(2) # isn't correct for 32-bit, but hey this is just a testcase

ld/testsuite/ld-powerpc/powerpc.exp

@@ -374,6 +374,7 @@ if [ supports_ppc64 ] then {
     run_dump_test "tlsie"
 }
 
+run_dump_test "localgot"
 run_dump_test "tlsldopt32"
 
 run_ld_link_tests $ppceabitests