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Implement proper folding of statepoint meta operands (deopt and GC) when statepoint uses tied registers. For deopt operands it is just about properly preserving tiedness in new instruction. For tied GC operands folding is a little bit more tricky. We can fold tied GC operands only from InlineSpiller, because it knows how to properly reload tied def after it was turned into memory operand. Other users (e.g. peephole) cannot properly fold such operands as they do not know how (or when) to reload them from memory. We do this by un-tieing operand we want to fold in InlineSpiller and allowing to fold only untied operands in foldPatchpoint.
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