[NativeAOT-LLVM] Post-merge tasks

[SingleAccretion]

This issue is intended to be a continuously updated list of things that should be done after the next upstream merge or in the merge PR itself (if necessary for a "clean" merge).

Current list:

• Switch NativeAotSupported to true. This shouldn't have the fallout it did last time with Consolidate <NativeAotSupported definitions runtime#103273. (?)
• Adjust our code for RhpNew functions due to Share allocation helpers between CoreCLR and NativeAOT runtime#115339: update the hardcoded symbol list in CorInfoImpl.Lllvm.cs, add/rename new helpers as necessary.
• Check if we need any code adjustments due to Fold generic method bodies by default runtime#117411 (we use a dummy interner).
• Remove our cmake code to use C++17 in the LLVM Jit: Update build to use C++17 compiler standard level runtime#118858.
• React to Fix deadlock when creating threads from ModuleInitializer in a shared library runtime#118928 (need to add the new RPI helper kind to wasm/PInvoke.cpp).
• Remove TargetsWasm property from Directory.Build.props (added upstream in Portable EntryPoint feature runtime#119178).

[yowl]

Will we be able to remove Microsoft.DotNet.ILCompiler.SingleEntry.targets, https://github.com/dotnet/runtimelab/pull/2248/files#diff-29f00866a1dc9b2d5c3acb94480513bacbc05775e9ac3dea25215287a20d979aR3 at some point?

[SingleAccretion]

Will we be able to remove Microsoft.DotNet.ILCompiler.SingleEntry.targets at some point?

Not sure. It seems a fine way to share upstream code while pulling runtime pieces from NuGets for now.