Eliminate gtLsraInfo from GenTree
Generate TreeNodeInfo into the map when building RefPositions. Add some new methods and flags for former gtLsraInfo functionality that's used outside of LSRA: - GenTree::GetRegisterDstCount() (number of registers defined by a node) - LIR::Flags::RegOptional - gtDebugFlags::GTF_DEBUG_NODE_LSRA_ADDED Fix dotnet/coreclr#7255 Commit migrated from https://github.com/dotnet/coreclr/commit/4157555a94ee1d0fe9831bef12d39fed1ac7d1cf
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