literal_syms): New global variables.
(xtensa_define_label, add_target_symbol, xtensa_find_label,
map_over_defined_symbols, is_loop_target_label,
xtensa_mark_target_fragments, xtensa_move_frag_symbol,
xtensa_move_frag_symbols, defined_symbols, branch_targets): Delete.
(xtensa_begin_directive): Call md_flush_pending_output. Move symbols
from insn_labels to saved_insn_labels when entering a literal region.
(xtensa_end_directive): Call md_flush_pending_output. Restore
insn_labels list when leaving a literal region.
(xtensa_literal_position): Call xtensa_clear_insn_labels.
(xtensa_literal_pseudo): Add check to disallow .literal inside a
literal region. Move insn_labels to saved_insn_labels and then restore
insn_labels on exit.
(xg_add_branch_and_loop_targets): Replace add_target_symbol calls with
code to set is_loop_target or is_branch_target flag on the symbol
(xtensa_create_literal_symbol): Call xtensa_add_literal_sym.
(xtensa_add_literal_sym, xtensa_add_insn_label,
xtensa_clear_insn_labels): New functions.
(xtensa_move_labels): Remove old_frag and old_offset arguments. Add
loops_ok argument. Rewrite to use insn_labels list instead of
calling xtensa_find_label and to check the is_loop_target flag on
symbols when loops_ok is false.
(xtensa_frob_label): Remove call to xtensa_define_label. Add call
to either xtensa_add_literal_sym or xtensa_add_insn_label. Adjust
call to xtensa_move_labels. Propagate is_branch_target and
is_loop_target flags from symbols to frags.
(xtensa_flush_pending_output): Call xtensa_clear_insn_labels.
(md_assemble): Use xtensa_move_labels with loops_ok = FALSE when
aligning a loop instruction. Adjust call to xtensa_move_labels for
aligning entry instructions. Add call to xtensa_clear_insn_labels.
(xtensa_end): Remove call to xtensa_mark_target_fragments.
(xtensa_move_literals): Replace xtensa_move_frag_symbols call with
code to use new literal_syms list.
* config/tc-xtensa.h (xtensa_symfield_type): Add is_loop_target and
is_branch_target flags.
