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Rename "read_reg" into "read_addr_from_reg" in struct dwarf_expr_context_funcs

This is to help make it slightly clearer how this method is expected
to extract data from the given register.

gdb/ChangeLog:

        * dwarf2expr.h (struct dwarf_expr_context_funcs)
        <read_addr_from_reg>: Renames "read_reg".
        * dwarf2-frame.c (read_addr_from_reg): Renames "read_reg".
        Adjust comment.
        (dwarf2_frame_ctx_funcs, execute_stack_op, dwarf2_frame_cache):
        Use read_addr_from_reg in place of read_reg.
        * dwarf2expr.c (execute_stack_op): Use read_addr_from_reg
        in place of read_reg.
        * dwarf2loc.c (dwarf_expr_read_addr_from_reg): Renames
        dwarf_expr_read_reg.
        (dwarf_expr_ctx_funcs): Replace dwarf_expr_read_reg
        with dwarf_expr_read_addr_from_reg.
        (needs_frame_read_addr_from_reg): Renames needs_frame_read_reg.
        (needs_frame_ctx_funcs): Replace needs_frame_read_reg with
        needs_frame_read_addr_from_reg.
Add R_X86_64_PC32_BND and R_X86_64_PLT32_BND

bfd/

	* elf64-x86-64.c (x86_64_elf_howto_table): Add R_X86_64_PC32_BND
	and R_X86_64_PLT32_BND.
	(R_X86_64_standard): Replace R_X86_64_RELATIVE64 with
	R_X86_64_PLT32_BND.
	(IS_X86_64_PCREL_TYPE): Add R_X86_64_PLT32_BND.
	(x86_64_reloc_map): Add BFD_RELOC_X86_64_PC32_BND and
	BFD_RELOC_X86_64_PLT32_BND.
	(elf_x86_64_check_relocs): Handle R_X86_64_PC32_BND and
	R_X86_64_PLT32_BND.
	(elf_x86_64_gc_sweep_hook): Likewise.
	(elf_x86_64_relocate_section): Likewise.
	* reloc.c (bfd_reloc_code_real): Add BFD_RELOC_X86_64_PC32_BND
	and BFD_RELOC_X86_64_PLT32_BND.
	* bfd-in2.h: Regenerated.
	* libbfd.h: Likewise.

gas/

	* config/tc-i386.c (reloc): Add an argument, bnd_prefix, to
	indicate if instruction has the BND prefix.  Return
	BFD_RELOC_X86_64_PC32_BND instead of BFD_RELOC_32_PCREL if
	bnd_prefix isn't zero.
	(output_branch): Pass BFD_RELOC_X86_64_PC32_BND to frag_var
	if needed.
	(output_jump): Update reloc call.
	(output_interseg_jump): Likewise.
	(output_disp): Likewise.
	(output_imm): Likewise.
	(x86_cons_fix_new): Likewise.
	(lex_got): Add an argument, bnd_prefix, to indicate if
	instruction has the BND prefix.  Use BFD_RELOC_X86_64_PLT32_BND
	if needed.
	(x86_cons): Update lex_got call.
	(i386_immediate): Likewise.
	(i386_displacement): Likewise.
	(md_apply_fix): Handle BFD_RELOC_X86_64_PC32_BND and
	BFD_RELOC_X86_64_PLT32_BND.
	(tc_gen_reloc): Likewise.
	* config/tc-i386-intel.c (i386_operator): Update lex_got call.

gas/testsuite/

	* gas/i386/i386.exp: Run x86-64-mpx-branch-1 and
	x86-64-mpx-branch-2 on 64-bit ELF targets.
	* gas/i386/x86-64-mpx-branch-1.d: New file.
	* gas/i386/x86-64-mpx-branch-1.s: Likewise.
	* gas/i386/x86-64-mpx-branch-2.d: Likewise.
	* gas/i386/x86-64-mpx-branch-2.s: Likewise.

include/elf/

	* x86-64.h: Add R_X86_64_PC32_BND and R_X86_64_PLT32_BND.

ld/testsuite/

	* ld-x86-64/mpx.exp: New file.
	* ld-x86-64/mpx1.out: Likewise.
	* ld-x86-64/mpx1a.c: Likewise.
	* ld-x86-64/mpx1a.rd: Likewise.
	* ld-x86-64/mpx1b.c: Likewise.
	* ld-x86-64/mpx1c.c: Likewise.
	* ld-x86-64/mpx1c.rd: Likewise.
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