[Xtensa] avoid extra entries in literal tables

[Bob Wilson]

The Xtensa literal tables (e.g., .xt.lit sections) are not relevant for 
"absolute-mode" literals (e.g., in .lit4 sections), but in some cases, literal 
table entries were being generated for them anyway.  This patch changes GAS so 
that the "is_literal" flag is only set by the mark_literal_frags() function. 
Tested with an xtensa-elf target and committed on the mainline and 2.17 branch.

2006-04-25  Bob Wilson  <bob.wilson@acm.org>

	* config/tc-xtensa.c (xtensa_create_literal_symbol,
	xg_assemble_literal, xg_assemble_literal_space): Do not set the
	frag's is_literal flag.
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