[llvm-commits] [patch] Use the range metadata in CodeGen

[Rafael Espíndola]

I have committed a change so that CodeGen's computeMaskedBits can use
the range metadata. With that in, this patch simplifies as it is not
necessary to produce an extLoad anymore.

I aso changed isTruncateOf a bit to avoid calling ComputeMaskedBits
twice on the same value.

Cheers,
Rafael
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