x86/mce: Stop mce_reign() from re-computing severity for every CPU

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  20d51a426fe9 ("x86/mce: Reuse one of the u16 padding fields in 'struct mce'")

a field was added to "struct mce" to save the computed error severity.

Make use of this in mce_reign() to avoid re-computing the severity
for every CPU.

In the case where the machine panics, one call to mce_severity() is
still needed in order to provide the correct message giving the reason
for the panic.

Signed-off-by: Tony Luck <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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