[NFC] Reduce number of run steps in ppc rop-protect test. (#139607)

Test was running both -mcpu=pwrN and -mcpu=powerN compile steps for
power N = 8, 9 and 10. Reduce to one run step for each form using power8
for one instance and power 10 for the other.

Author: mandlebug

clang/test/Driver/ppc-mrop-protection-support-check.c

@@ -1,20 +1,10 @@
 // RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
 // RUN:   -mcpu=pwr10 -mrop-protect %s 2>&1 | FileCheck %s --check-prefix=HASROP
 // RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
-// RUN:   -mcpu=power10 -mrop-protect %s 2>&1 | FileCheck %s --check-prefix=HASROP
-// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
-// RUN:   -mcpu=pwr9 -mrop-protect %s 2>&1 | FileCheck %s --check-prefix=HASROP
-// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
-// RUN:   -mcpu=power9 -mrop-protect %s 2>&1 | FileCheck %s --check-prefix=HASROP
-// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
-// RUN:   -mcpu=pwr8 -mrop-protect %s 2>&1 | FileCheck %s --check-prefix=HASROP
-// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
 // RUN:   -mcpu=power8 -mrop-protect %s 2>&1 | FileCheck %s --check-prefix=HASROP
 
 // RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
 // RUN:   -mcpu=pwr7 -mrop-protect %s 2>&1 | FileCheck %s --check-prefix=NOROP
-// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
-// RUN:   -mcpu=power7 -mrop-protect %s 2>&1 | FileCheck %s --check-prefix=NOROP
 
 // RUN: not %clang -target powerpc-unknown-linux -fsyntax-only \
 // RUN: -mcpu=pwr8 -mrop-protect %s 2>&1 | FileCheck %s --check-prefix=32BIT