[PATCH] Solve three issues with Thumb literal loads

[Mihail Popa]

Hi. Please review the attached patch.

It solves three issues with Thumb literal loads, namely:

1. The offset range for Thumb1 PC relative loads is [0..1020] and not
[-1024..1020]
2. Thumb2 PC relative loads may define the PC, so the restriction placed on
target register is removed
3. Removes unneeded alias between "ldr.n" and t1LDRpci. ".n" is actually
stripped by both tablegen
and the ASM parser, so this alias rule really does nothing

Regards,
Mihai
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