Make gdb/regcache.h self-contained.

	gdb/
	* regcache.h (struct regset): Declare.

Commit 0b3092721e5cfa1697f1dafe81efefdbb0236f21 added uses of struct regset to
gdb/regcache.h, but that struct is not declared in this file, and, as it
happens, also nowhere else in the #include chain on x86 GNU/Hurd.  This results
in warnings/errors such as:

    gcc-4.8 [...] ../../W._C._Handy/gdb/gdb.c
    In file included from ./nm.h:25:0,
                     from ../../W._C._Handy/gdb/defs.h:454,
                     from ../../W._C._Handy/gdb/gdb.c:19:
    ../../W._C._Handy/gdb/regcache.h:190:9: warning: 'struct regset' declared inside parameter list [enabled by default]
             size_t size);
             ^
    ../../W._C._Handy/gdb/regcache.h:190:9: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
    ../../W._C._Handy/gdb/regcache.h:193:10: warning: 'struct regset' declared inside parameter list [enabled by default]
              int regnum, void *buf, size_t size);
              ^
daily update
Test for overflow in eh_frame_hdr entries and for overlapping FDEs

With larger binaries on 64-bit systems, or indeed just binaries that
have a large gap between text and data, it is possible for the
.eh_frame_hdr lookup table entry values to overflow a signed 32-bit
relative offset.  It is also a requirement for the glibc FDE lookup
code that only one FDE claim to cover any given address.

	* elf-bfd.h (struct eh_frame_array_ent): Add "range".
	* elf-eh-frame.c (_bfd_elf_write_section_eh_frame): Stash address
	range of FDEs to hdr_info->array.
	(_bfd_elf_write_section_eh_frame_hdr): Report overflow in
	.eh_frame_hdr entries, and overlapping FDEs.
Fix tc-i386.c -Werror=logical-not-parentheses error

	* config/tc-i386.c (match_template): Remove redundant "!!" testing
	single-bit bitfields.
	(build_modrm_byte): Don't compare single-bit bitfields to "1".