Convert more tests to use compile_flags.exp functions for compile flags.

Convert more tests to use compile_flags.exp functions for compile flags.

* testsuite/lib/compile_flags.exp (arch_compile_flag_bits): New function.
* testsuite/systemtap.base/func_alias.exp: Convert to use
  testsuite/lib/compile_flags.exp for compile flags, ABIs, etc.
* testsuite/systemtap.base/hash_add_buildid.exp: Ditto.
* testsuite/systemtap.base/utrace_syscall_args.exp: Ditto.
* testsuite/systemtap.base/vma_vdso.exp: Ditto.
* testsuite/systemtap.context/fib.exp: Ditto.
* testsuite/systemtap.syscall/nd_syscall.exp: Ditto.
* testsuite/systemtap.syscall/syscall.exp: Ditto.