intel/ibc: Add texturing support

Merged Faith Ekstrand requested to merge wip/ibc-tex into ibc

This MR adds texturing support to IBC. It doesn't try to 100% solve the payload problem. It just makes a physical reg and fills it with stuff. However, all the texture opcodes appear to be basically working now.

Related: #21 (closed)

Edited by Faith Ekstrand

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