x86: Convert BUG() to use unreachable()
Use the new unreachable() macro instead of for(;;);. When allyesconfig is built with a GCC-4.5 snapshot on i686 the size of the text segment is reduced by 3987 bytes (from 6827019 to 6823032). Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com> Acked-by: N"H. Peter Anvin" <hpa@zytor.com> CC: Thomas Gleixner <tglx@linutronix.de> CC: Ingo Molnar <mingo@redhat.com> CC: x86@kernel.org Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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