If Homogeneous Aggregate can only partially fit into VFP registers, we add padding to make sure HA will be on stack and later VFP CPRCs will be on stack as well.
There is a discussion on whether we should use byval to pass things on stack: llvm-commits: ABI: how to let the backend know that an aggregate should be allocated on stack For now, the patch implemented what Eli suggested. Please review, Thanks, Manman
arm_ha.patch
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