[AMDGPU] Rematerialize VGPR candidates when SGPR spills results in VGPR Excess (#168079) Before, when selecting candidates to rematerialize, we would only consider SGPR candidates when there was an excess of SGPR registers. Failing to eliminate the excess would result in spills to VGPRs. This is normally not an issue, unless spilling to VGPRs results in excess VGPRs. This patch does 2 things: * It relaxes the GCNRPTarget success criteria: now we accept regions where we spill SGPRs to VGPRs, as long as this does not end up in excess VGPRs. * It changes isSaveBeneficial to consider the excess VGPRs (which includes the SGPRs that would be spilled to VGPR). With these changes, the compiler rematerializes VGPRs when the excess SGPRs would result in VGPR excess. This has some unaddressed flaws: we should attempt to rematerialize SGPRs first in order to eliminate the SGPR excess that results in VGPR excess. Related to SWDEV-549940
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