x86/irq: Copy vectormask instead of an AND operation

In the case that the new vector mask is a subset of the existing mask there is
no point to do a AND operation of currentmask & newmask. The result is
newmask. So we can simply copy the new mask to the current mask and be done
with it. Preparatory patch for further consolidation.

Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Borislav Petkov <[email protected]>
Tested-by: Joe Lawrence <[email protected]>
Cc: Jiang Liu <[email protected]>
Cc: Jeremiah Mahler <[email protected]>
Cc: [email protected]
Cc: Guenter Roeck <[email protected]>
Cc: [email protected] #4.3+
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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