[PATCH] Fix encoding of constant in ARM "adr rN, #Const" instruction

[Keith Walker]

This patch fixes the encoding of the constant value in ARM "adr rN, #Const"
instruction which currently asserts on some "Const" values that can be
validly encoded in the instruction.

An example of an instruction that can be validly encoded in an adr
instruction but is currently be rejected is:
   adr  r1, #0x80000001

Please review this patch and provide any feedback.
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