xcompile: Use local variables in the test functions

Using the local variables instead of positional parameters helps
readability.
- Add and use the local variables in testcc.
- Use the existing local variables in testld.

Change-Id: Ice13288b830a7aa043b360eaee8e36f060589a18
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12844
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed