revise Xtensa longcall relaxtion in GAS

[Bob Wilson]

This patch makes some changes to the behavior of longcall expansions in the 
Xtensa port of GAS:

- Always relax calls to weak symbols even if longcalls are not enabled.  This 
fixes GCC test g++.dg/warn/weak1.C.

- Relax a call out of range within a section even if longcalls are not enabled. 
  This doesn't come up much but it seems like a good thing to handle.

I updated some comments and fixed a few minor formatting issues, too.  Tested 
successfully with the GAS testsuite for an xtensa-elf target.  Committed on the 
mainline and 2.16 branch.


2005-03-25  Bob Wilson  <bob.wilson@acm.org>

	* config/tc-xtensa.c (use_longcalls): Delete.
	(xg_symbolic_immeds_fit): Check for direct calls and return TRUE if
	the use_longcalls flag is set.  Do this before checking the segment.
	(xg_expand_assembly_insn): Rearrange to use new do_expand flag.  Never
	expand direct calls at this point.
	(xtensa_set_frag_assembly_state): Set use_longcalls flag.
	(xtensa_find_unmarked_state_frags): Likewise.
	(md_assemble): Do not disable longcalls by setting is_specific_opcode.
	(xg_assemble_vliw_tokens): Switch frags when use_longcalls changes.
	(convert_frag_immed): Remove unnecessary check of is_specific_opcode.
	* config/tc-xtensa.h (xtensa_frag_type): Add use_longcalls flag.


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