[PATCH, rs6000] fix failure test cases caused by disabling mode promotion for pseudos [PR100952]

[HAO CHEN GUI via Gcc-patches]

Hi

   The patch changed matching conditions in pr81384.c and pr56605.c. 
The original conditions failed to match due to mode promotion disabled.

   The attachments are the patch diff and change log file.

   Bootstrapped and tested on powerpc64le-linux with no regressions. Is 
this okay for trunk? Any recommendations? Thanks a lot.

        PR target/100952
        * gcc/testsuite/gcc.target/powerpc/pr56605.c: Change matching
        conditions.
        * gcc/testsuite/gcc.target/powerpc/pr81348.c: Likewise.

diff --git a/gcc/testsuite/gcc.target/powerpc/pr56605.c 
b/gcc/testsuite/gcc.target/powerpc/pr56605.c
index 29efd815adc..2b7ddbd7410 100644
--- a/gcc/testsuite/gcc.target/powerpc/pr56605.c
+++ b/gcc/testsuite/gcc.target/powerpc/pr56605.c
@@ -11,5 +11,5 @@ void foo (short* __restrict sb, int* __restrict ia)
     ia[i] = (int) sb[i];
 }
 
-/* { dg-final { scan-rtl-dump-times "\\\(compare:CC \\\((?:and|zero_extend):DI 
\\\(reg:\[SD\]I" 1 "combine" } } */
+/* { dg-final { scan-rtl-dump-times "\\\(compare:CC \\\((?:and|zero_extend):SI 
\\\(subreg:SI \\\(reg:\[SD\]I" 1 "combine" } } */
 
diff --git a/gcc/testsuite/gcc.target/powerpc/pr81348.c 
b/gcc/testsuite/gcc.target/powerpc/pr81348.c
index 7037acf0c22..8043d06bcde 100644
--- a/gcc/testsuite/gcc.target/powerpc/pr81348.c
+++ b/gcc/testsuite/gcc.target/powerpc/pr81348.c
@@ -19,5 +19,5 @@ void d(void)
         ***c = e;
 }
 
-/* { dg-final { scan-assembler {\mlxsihzx\M}  } } */
-/* { dg-final { scan-assembler {\mvextsh2d\M} } } */
+/* { dg-final { scan-assembler {\mlha\M}  } } */
+/* { dg-final { scan-assembler {\mmtvsrwa\M} } } */