fix Xtensa variable-size argument passing

[Bob Wilson]

The new compat/struct-by-value-22 test exposed some argument passing problems in 
the Xtensa port for arguments with variable size.  I've committed this patch on 
the mainline.  Tested by running the testsuite with an xtensa-elf target.

2004-07-14  Bob Wilson  <bob.wilson@acm.org>

         * config/xtensa/xtensa.c (function_arg_advance): Check for args
         that must be passed in the stack.
         (xtensa_gimplify_va_arg_expr): Skip special-case padding for small
         arguments if the size is not a constant.

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