x86/microcode/intel: Move the BUG_ON up and turn it into WARN_ON

If we're going to BUG_ON() because we're running on the wrong CPU, we
better do it as the first thing we do when entering that function. And
also, turn it into a WARN_ON() because it is not worth to panic the
system if we apply the microcode on the wrong CPU - we're simply going
to exit early.

Tested-by: Thomas Voegtle <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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