Removing dead frame indices for VGPR to AGPR spills is incorrect
when the frame index is shared by multiple objects, which may
occur due to stack slot coloring. The problem is that subsequent
code processes the other object will assert because the stack
frame index has been marked dead.
Removing dead frame indices is needed prior to stack slot
coloring, which is what happens with SGPR to VGPR spills. These
spills are lowered prior to stack slot coloring, but the VGPR
to AGPR spills are processed afterwards during the Prolog/Epilog
Inserter pass.