NFC: Mark instrprof-gc-sections.c unsupported on ppc64le

PR #99056 marked this test case as an XFAIl for ppc64le but it
is actually being temporary unsupported, this changes it from
an XFAIl to unsupported.

Author: kamaub

compiler-rt/test/profile/instrprof-gc-sections.c

@@ -1,7 +1,8 @@
 // REQUIRES: linux, lld-available
 
 // FIXME: Investigate and fix.
-// XFAIL: powerpc64-target-arch, powerpc64le-target-arch
+// XFAIL: powerpc64-target-arch
+// UNSUPPORTED: powerpc64le-target-arch
 
 // RUN: rm -rf %t.profraw
 // RUN: %clang_profgen=%t.profraw -fuse-ld=lld -fcoverage-mapping -mllvm -enable-name-compression=false -DCODE=1 -ffunction-sections -fdata-sections -Wl,--gc-sections -o %t %s