[PATCH] Add range checking for Thumb2 PC-relative loads

[Mihail Popa]

Hi.

Kindly review the attached patch. It adds range checking for "ldr Rn, 
[pc, #imm]" Thumb
instructions. With this patch:

1. ldr.n is recognized as mnemonic for the short encoding
2. ldr.w is recognized as menmonic for the long encoding
3. ldr will map to either short or long encodings depending on the size 
of the offset

Regards,
Mihai
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