lto: Bypass assembler when generating LTO object files.

    This patch applies Jan Hubicka previous patch on current sources.
    Now compiler is able to produce object files without assembler although
    a lot of things are missing such as __lto_slim symbol, debug symbols
    etc. They will be added in future patches. To test this current patch,
    use these command below.
    1) ./xgcc -B ./ -O3 a.c -flto -S -fbypass-asm=crtbegin.o  -o a.o
    2) ./xgcc -B ./ -O2 a.o -flto
    3)  ./a.out

    We are currntly working with elf-only support (mach-o, coff, xcoff etc
    will be dealt later) so this will only work on a linux machine. I have tested
    this on my machine ( Arch linux, Machine: Advanced Micro Devices X86-64) and
    all LTO test cases passed as expected.

    gcc/ChangeLog:

            * Makefile.in:
            * common.opt:
            * langhooks.cc (lhd_begin_section):
            (lhd_append_data):
            (lhd_end_section):
            * lto/lto-object.cc: Moved to...
            * lto-object.cc: ...here.
            * lto-streamer.h (struct lto_section_slot):
            (struct lto_section_list):
            (struct lto_file):
            (lto_obj_file_open):
            (lto_obj_file_close):
            (lto_obj_build_section_table):
            (lto_obj_create_section_hash_table):
            (lto_obj_begin_section):
            (lto_obj_append_data):
            (lto_obj_end_section):
            (lto_set_current_out_file):
            (lto_get_current_out_file):
            * toplev.cc (compile_file):
            (lang_dependent_init):

    gcc/lto/ChangeLog:

            * Make-lang.in:
            * lto-common.cc (lto_file_read):
            * lto-lang.cc:
            * lto.h (struct lto_file):
            (lto_obj_file_open):
            (lto_obj_file_close):
            (struct lto_section_list):
            (lto_obj_build_section_table):
            (lto_obj_create_section_hash_table):
            (lto_obj_begin_section):
            (lto_obj_append_data):
            (lto_obj_end_section):
            (lto_set_current_out_file):
            (lto_get_current_out_file):
            (struct lto_section_slot):

Signed-off-by: Rishi Raj <rishiraj45035@gmail.com>

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