[gcc r13-5108] rs6000/test: Make ppc-fortran.exp only available for PowerPC target

[Kewen Lin <linkw@gcc.gnu.org>]

https://gcc.gnu.org/g:de99049f6fe5341024d4d939ac50d063280f90db

commit r13-5108-gde99049f6fe5341024d4d939ac50d063280f90db
Author: Kewen Lin <linkw@linux.ibm.com>
Date:   Wed Jan 11 06:59:24 2023 -0600

    rs6000/test: Make ppc-fortran.exp only available for PowerPC target
    
    When testing one patch which adds a fortran test case into
    test bucket powerpc/ppc-fortran/, I found one unexpected
    failure on a non-PowerPC target.  It's due to that
    ppc-fortran.exp does not exit early if the testing target
    isn't a PowerPC target.  This patch is to make it exit
    immediately if the testing target isn't a PowerPC target.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/powerpc/ppc-fortran/ppc-fortran.exp: Exit immediately if
            the testing target isn't a PowerPC target.

Diff:
---
 gcc/testsuite/gcc.target/powerpc/ppc-fortran/ppc-fortran.exp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gcc/testsuite/gcc.target/powerpc/ppc-fortran/ppc-fortran.exp b/gcc/testsuite/gcc.target/powerpc/ppc-fortran/ppc-fortran.exp
index bd7ad95ad0d..ded643b56bf 100644
--- a/gcc/testsuite/gcc.target/powerpc/ppc-fortran/ppc-fortran.exp
+++ b/gcc/testsuite/gcc.target/powerpc/ppc-fortran/ppc-fortran.exp
@@ -16,6 +16,11 @@
 
 # GCC testsuite that uses the `dg.exp' driver.
 
+# Exit immediately if this isn't a PowerPC target.
+if { ![istarget powerpc*-*-*] && ![istarget rs6000-*-*] } then {
+  return
+}
+
 # Load support procs.
 load_lib gfortran-dg.exp