[PATCH, rs6000] Update pr88233.c test (pr91799)

Hi,

This is a follow-up fix to clean up pr91799.  Per review of test results,
it appears that the combination of target and dg-require stanzas is
not sufficient to properly limit the test to 64-bit only on darwin.

This adds additional clauses to limit the test to 64-bit environments, and
to configs that support at least power8 codegen.

Tested on power7 and power8 using assorted variations of
  make -k check-gcc-c "RUNTESTFLAGS=powerpc.exp=pr88233.c
  --target_board=unix/'{-mcpu=power7,-mcpu=power6,-mcpu=power8}''{-m32,-m64}'"

OK for trunk?

PR target/91799

2021-01-14  Will Schmidt <will_schm...@vnet.ibm.com>

gcc/testsuite/ChangeLog:
        * gcc.target/powerpc/pr88233.c: Update dg-require stanzas.

diff --git a/gcc/testsuite/gcc.target/powerpc/pr88233.c 
b/gcc/testsuite/gcc.target/powerpc/pr88233.c
index 8e5f15b83b50..acea7a586867 100644
--- a/gcc/testsuite/gcc.target/powerpc/pr88233.c
+++ b/gcc/testsuite/gcc.target/powerpc/pr88233.c
@@ -1,6 +1,7 @@
-/* { dg-do compile { target lp64 } } */
+/* { dg-require-effective-target lp64 } */
+/* { dg-require-effective-target has_arch_pwr8 } */
 /* { dg-options "-O2 -mdejagnu-cpu=power8" } */
 
 typedef struct { double a[2]; } A;
 A
 foo (const A *a)

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