x86/boot: Discard .eh_frame sections

When using GCC as compiler and LLVM's lld as linker, linking setup.elf
fails:

   LD      arch/x86/boot/setup.elf
  ld.lld: error: init sections too big!

This happens because GCC generates .eh_frame sections for most of the
files in that directory, then ld.lld places the merged section before
__end_init, triggering an assert in the linker script.

Fix this by discarding the .eh_frame sections, as suggested by Boris.
The kernel proper linker script discards them too.

 [ bp: Going back in history, 64-bit kernel proper has been discarding
   .eh_frame since 2002:

    commit acca80acefe20420e69561cf55be64f16c34ea97
    Author: Andi Kleen <[email protected]>
    Date:   Tue Oct 29 23:54:35 2002 -0800

      [PATCH] x86-64 updates for 2.5.44

      ...

    - Remove the .eh_frame on linking. This saves several hundred KB in the
      bzImage
 ]

Suggested-by: Borislav Petkov <[email protected]>
Signed-off-by: Ilie Halip <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Nick Desaulniers <[email protected]
Cc: Andy Lutomirski <[email protected]>
Cc: [email protected]
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]/
Link: https://github.com/ClangBuiltLinux/linux/issues/760
Link: https://lkml.kernel.org/r/[email protected]

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