make autprofiledbootstrap with LTO meaningful

make autprofiledbootstrap with LTO meaningful

currently autoprofiled bootstrap produces auto-profiles for cc1 and cc1plus
binaries.  Those are used to build respective frontend files.  For backend
cc1plus.fda is used.   This does not work well with LTO bootstrap where cc1plus
backend is untrained since it is used only for parsing and ealry opts. As a
result all binaries gets most of the backend optimized for size rather then
speed.

This patch adds lto1.fda and then combines all of cc1, cc1plus and lto1 into
all.fda that is used compiling common modules.  This is more or less equivalent
to what -fprofile-use effectively uses modulo that with -fprofile-use we know
number of runs of evety object file and scale accordingly at LTO time.

gcc/ChangeLog:

	* Makefile.in (ALL_FDAS): New variable.
	(ALL_HOST_BACKEND_OBJ): Use all.fda instead of cc1plus.fda
	(all.fda): New target

gcc/c/ChangeLog:

	* Make-lang.in: Add c_FDAS
	(create_fdas_for_cc1): Be sure that build fails if create_gcov fails.

gcc/cp/ChangeLog:

	* Make-lang.in: Add c++_FDAS
	(create_fdas_for_cc1plus): Be sure that build fails if create_gcov fails.

gcc/lto/ChangeLog:

	* Make-lang.in: Add lto_FDAS; enable FDA collection
	(create_fdas_for_lto1): Be sure that build fails if create_gcov fails.