[ARM] [2/4] Introduce inv_entry macro to contain common entry code
This is the second of 4 patches which factor out common code in the ARM exception entry assembly code, aiming towards a reduction in the size of the changes required here for SMP support. These patches are low impact, and will be merged over the coarse of the next 3 days. This patch addresses the code handling exception entry from invalid (irq, fiq, abort) modes. However, in converting to a macro, a minor bug has been fixed which would merely cause a misleading register dump.
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