Merge pull request dotnet/coreclr#15348 from mikedn/ssa-indir

Remove useless IndirectAssignmentAnnotation

Commit migrated from https://github.com/dotnet/coreclr/commit/9352f69ffbf25762d0c631b7e84389f0d111bcd4

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/gentree.cpp
Simple merge

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

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

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

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