Restore the thumb mode when jumping to the landingPad.

When we read the IP, we restore the thumbBit onto the landingPad
variable. Then when we jump to the landingPad, we use "bx" instead
of "mov" to use the thumb bit.

Change-Id: Ic534a183a3ca868baf71fe435556b9d88c80c744
Merge pull request #66 from awong-dev/jumpto

Restore the thumb mode when jumping to the landingPad.