This patch fixes a problem with ObjC symbols not being properly skipped
over during decode_line_1 processing. ObjC symbols can have spaces and
parenthesis in them, so they need special handling, otherwise you get
odd warnings like:

Error in re-setting breakpoint 2:
Function "-[NSObject(NEXTSTEP)" not defined.

or

Error in re-setting breakpoint 2:
Function "" not defined.