Synchronize include/dwarf2.def with binutils

The contents of include/dwarf2.def have diverged between the gcc and
the binutils repositories.  Currently, it's impossible to build a combined
tree, as GCC won't build with the binutils version of dwarf2.def and binutils
won't build with the gcc version.  This patch realigns this file by copying
the defintion of DW_CFA_AARCH64_negate_ra_state_with_pc from binutils,
restoring the ability to build a combined source tree.

2025-02-11  Roger Sayle  <roger@nextmovesoftware.com>

include/ChangeLog
	* dwarf2.def (DW_CFA_AARCH64_negate_ra_state_with_pc): Define.

Author: rogersayle

include/dwarf2.def

@@ -788,6 +788,8 @@ DW_CFA (DW_CFA_hi_user, 0x3f)
 
 /* SGI/MIPS specific.  */
 DW_CFA (DW_CFA_MIPS_advance_loc8, 0x1d)
+/* AArch64 extensions.  */
+DW_CFA (DW_CFA_AARCH64_negate_ra_state_with_pc, 0x2c)
 /* GNU extensions.
    NOTE: DW_CFA_GNU_window_save is multiplexed on Sparc and AArch64.  */
 DW_CFA (DW_CFA_GNU_window_save, 0x2d)