Craig Topper 16ddd25b69 Revert "[GISel] Add LookThroughInstrs for getIConstantVRegVal and getIConstan… (#68327)" ...

This reverts commit 28ae42e662.

The assert in getIConstantVRegVal was not updated for this change.
The ValAndVReg->VReg == VReg check fails if any look through happens.

RISC-V was the only target using the lookthrough functionality, but I'm
not sure it was needed so I'm removing that too.

2023-11-04 12:21:06 -07:00

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