[Driver][test] clang_f_opts.c: unsupport AIX

AIX prefers rejecting certain unimplemented features like
-fprofile-sample-use, making clang_f_opts.c (legacy test file testing
many miscellaneous features) not suitable. We could specify --target=,
but this style change is probably not the best for this legacy file.

clang/test/Driver/clang_f_opts.c

@@ -1,4 +1,4 @@
-
+// UNSUPPORTED: target={{.*}}-aix{{.*}}
 // RUN: %clang -### -S -fasm -fblocks -fbuiltin -fno-math-errno -fcommon -fpascal-strings -fno-blocks -fno-builtin -fmath-errno -fno-common -fno-pascal-strings -fblocks -fbuiltin -fmath-errno -fcommon -fpascal-strings -fsplit-stack %s 2>&1 | FileCheck -check-prefix=CHECK-OPTIONS1 %s
 // RUN: %clang -### -S -fasm -fblocks -fbuiltin -fno-math-errno -fcommon -fpascal-strings -fno-asm -fno-blocks -fno-builtin -fmath-errno -fno-common -fno-pascal-strings -fno-show-source-location -fshort-enums -fprotect-parens %s 2>&1 | FileCheck -check-prefix=CHECK-OPTIONS2 %s