* gdb.dwarf2/watch-notconst.exp: Use is_x86_like_target.
* gdb.dwarf2/valop.exp: Use is_x86_like_target.
* gdb.dwarf2/typeddwarf.exp: Use is_x86_like_target. Pass
-nostdlib to compiler.
* gdb.dwarf2/typeddwarf.S (_start): Rename from 'main'.
* gdb.dwarf2/pieces.exp: Use is_x86_like_target.
* gdb.dwarf2/implptr.exp: Use is_x86_like_target.
* gdb.dwarf2/dw2-restore.exp: Check for LP64.
* gdb.dwarf2/callframecfa.exp: Use is_x86_like_target.
* frame.h (frame_unwinder_is): Declare.
* frame.c (frame_unwinder_is): New function.
* dwarf2loc.c: Include dwarf2-frame.h.
(dwarf_expr_frame_cfa): New function.
(dwarf2_evaluate_loc_desc): Use it.
(needs_frame_frame_cfa): New function.
(dwarf2_loc_desc_needs_frame): Use it.
* dwarf2expr.h (struct dwarf_expr_context) <get_frame_cfa>: New
field.
* dwarf2expr.c (execute_stack_op) <DW_OP_call_frame_cfa>: New
case.
* dwarf2-frame.h (dwarf2_frame_cfa): Declare.
* dwarf2-frame.c (no_get_frame_cfa): New function.
(execute_stack_op): Use it.
(dwarf2_frame_cfa): New function.
gdb/testsuite
* gdb.dwarf2/callframecfa.exp: New file.
* gdb.dwarf2/callframecfa.S: New file.