[AMDGPU] Fix restores in chain functions (#116193) When spilling a VGPR in `emitPrologue`, chain functions prefer to use offsets to access the stack instead of the SP. This patch fixes `emitEpilogue` to do the same. It also brings back some test coverage that was lost in #93526, when WWM registers started being shifted to the lowest available range (which meant that tests that were originally spilling v8 would shift to spill v0, which is a scratch register for chain functions and didn't get spilled). Change-Id: Icb07fccd859b563cd45f74c25ae578ecb38bdeeb
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