cc/gcc: do not use the core pass-2 to build the baremetal compiler

In case we build a baremetal compiler, use the standard passes:
- core_cc is used to build the C library;
- as such, it is meant to run on build, not host;
- the final compiler is meant to run on host;

As the current final compiler step can not build a baremetal compiler,
call the core backend from the final step.

NB: Currently, newlib is built during the start_files pass, so we have
to have a core compiler by then... Once we can build the baremetal
compiler from the final cc step, then we can move the newlib build to
the proper step, and then get rid of the core pass-1 static compiler...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 2007-03-13  Mike Frysinger  <vapier@gentoo.org>

 	* sysdeps/unix/sysv/linux/sh/sys/procfs.h: Copy Linux's asm-sh/elf.h types.

 --- glibc-2_9/sysdeps/unix/sysv/linux/sh/sys/procfs.h

 +++ glibc-2_9/sysdeps/unix/sysv/linux/sh/sys/procfs.h

 @@ -29,10 +29,19 @@

  #include <sys/types.h>

  #include <sys/ucontext.h>

  #include <sys/user.h>

 -#include <asm/elf.h>

  __BEGIN_DECLS

 +/*

 + * ELF register definitions...

 + */

 +typedef unsigned long elf_greg_t;

 +

 +#define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))

 +typedef elf_greg_t elf_gregset_t[ELF_NGREG];

 +

 +typedef struct user_fpu_struct elf_fpregset_t;

 +

  struct elf_siginfo

    {

      int si_signo;			/* Signal number.  */