[Xtensa Patch] More performance enhancements

[Sterling Augustine]

This patch is the last in a series of performance improvements to Xtensa 
Gas. It continues the theme of only doing the necessary work when 
copying and using vinsns instead of the worst case.

This particular replaces most uses of MAX_SLOTS--the most vliw-slots a 
configuration could possibly support--with a calculated value for a 
particular configuration which is typically much lower.

Sterling

9-08-21  Sterling Augustine  <sterling@jaw.hq.tensilica.com>
	* config/tc-xtensa.c (config_max_slots): New global variable.
	(md_begin): Set config_max_slots.
	(total_frag_text_expansion): Use config_max_slots instead of
	MAX_SLOTS.
	(xg_init_vinsn): Likewise.
	(xg_clear_vinsn): Likewise.
	(xg_free_vinsn): Likewise.

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