[mono] Replace -disable-fp-elim with -frame-pointer=all

[imhameed]

-disable-fp-elim was removed in LLVM 8 in commit b7cef81fd36c85e52b115b9ed6d1fb92d63781d6.
Also see https://reviews.llvm.org/D56351.

The replacement option, -frame-pointer, is still present in LLVM 11.

Fixes #58112.

[SamMonoRT]

@marek-safar - this needs to be backported to RC1 and 6.0 branches - if it comes up in any of your meetings

[lambdageek]

/backport to release/6.0-rc1

[github-actions]

Started backporting to release/6.0-rc1: https://github.com/dotnet/runtime/actions/runs/1171271793

[imhameed]

I'm going to try to verify that this fixes #58112 by hand. The laptop I'm on is not especially fast and building a fresh main copy of xamarin-macios will take a while.

If someone else already has a working copy of main and would like to test this, you'll need to replace xamarin-macios/builds/downloads/dotnet-sdk-6.0.100-rc.*-osx-x64/packs/Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.ios-arm/6.0.0-rc.*/tools/mono-aot-cross with a copy built by building my branch of dotnet/runtime with ./build.sh mono+libs -os iOS -arch arm -configuration Release /p:MonoAOTEnableLLVM=true. The newly built copy of mono-aot-cross can be found in artifacts/bin/mono/iOS.arm.Release/cross/ios-arm/mono-aot-cross.

[marek-safar]

@imhameed please backport to 6.0 branch and send tactics approval request for RC1

[imhameed]

Tested locally; works for me. I can build tests/dotnet/MySingleView for arm.