Merge pull request dotnet/coreclr#8402 from CarolEidt/Fix7508

Enable promotion of SIMD fields of structs

Commit migrated from https://github.com/dotnet/coreclr/commit/26a6391c6e05c41bf48beaf529684ad44f3b3fa6

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

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