[SPIR-V] Add support for arbitrary precision integer constants in instruction printer (#185306) This PR improves the SPIR-V instruction printer output for integer constants using `SPV_ALTERA_arbitrary_precision_integers` extension. Previously, when `OpConstantI` was encoded with multiple 32-bit words (for integer widths > 64), the inst printer printed the raw per-word immediates. This was hard to read and did not reflect the actual value at the declared integer bitwidth. Now, with the change in this patch, the instruction printer reconstructs the multi-word literal into a single `APInt`, truncates it to the bitwidth declared by the corresponding `OpTypeInt`, and prints the resulting value as one readable integer (including correct negative values where applicable). --------- Co-authored-by: yixing.zhang <[email protected]>
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