Merge pull request dotnet/coreclr#12148 from mikedn/oper-dump

Make JIT dumps more readable

Commit migrated from https://github.com/dotnet/coreclr/commit/1a8f3a0b687497a264ea11dd9ad1cceef3d8e133

diff --cc src/coreclr/src/jit/codegenarmarch.cpp
Simple merge

diff --cc src/coreclr/src/jit/lsra.cpp
Simple merge

diff --cc src/coreclr/src/jit/lsraarm.cpp
Simple merge