This patch only introduces the structure definition and adjusts
the existing routines to use the new cur_trace global to access
the variables that were moved into the structure.
* dwarf2cfi.c (dw_trace_info): New.
(dw_label_info): New.
(cie_return_save): New.
(cur_trace): New.
(queued_args_size): Rename from args_size. Update all users.
(cfa_store, cfa_temp, regs_saved_in_regs): Remove.
(def_cfa_1): Use cur_trace instead of cfa_*.
(dwarf2out_stack_adjust, record_reg_saved_in_reg): Likewise.
(clobbers_queued_reg_save, reg_saved_in): Likewise.
(dwarf2out_frame_debug_expr): Likewise.
(create_cie_data): Split out from ...
(execute_dwarf2_frame): ... here. Initialize cur_trace.
From-SVN: r176704
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