Add target hook to override DWARF2 frame register size
gcc/
* target.def (TARGET_DWARF_FRAME_REG_MODE): New target hook.
* targhooks.c (default_dwarf_frame_reg_mode): New function.
* targhooks.h (default_dwarf_frame_reg_mode): New prototype.
* doc/tm.texi.in (TARGET_DWARF_FRAME_REG_MODE): Document.
* doc/tm.texi: Regenerate.
* dwarf2cfi.c (expand_builtin_init_dwarf_reg_sizes): Abstract mode
selection logic to default_dwarf_frame_reg_mode.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@214898 138bc75d-0d04-0410-961f-82ee72b054a4