(gdb-use-inferior-io-buffer, gdb-speedbar-auto-raise):

(gdb-use-inferior-io-buffer, gdb-speedbar-auto-raise):
Echo new state in minibuffer.
(gdb-var-create-handler, gdb-assembler-custom): Use search-forward
for plain strings.
(gdb-frames-mode): Remove redundant call to font-lock-mode.
(gdb-all-registers): Rename from toggle-gdb-all-registers.  Create
registers buffer if necessary.  Echo new state in minibuffer.
(gdb-registers-mode-map, gdb-registers-mode): Use gdb-all-registers.