Merge pull request dotnet/coreclr#6021 from CarolEidt/LessConservativeGtObj

Less conservative gt obj

Commit migrated from https://github.com/dotnet/coreclr/commit/aab8856ce0365ede77bb8ca8c208538a72185a54

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

diff --cc src/coreclr/src/jit/compiler.h
Simple merge

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

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

diff --cc src/coreclr/src/jit/gentree.h
Simple merge

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

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

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