compatibility fix for ORC JIT in llvm 14

[alexfanqi]

ORC JIT api has changed a bit in llvm 14. Although currently arm on Mac uses orc jit, the riscv port will need this.

Changes are introduced in llvm/llvm-project@118e953

[giordano]

Build of aarch64-apple-darwin, the only platform using ORC JIT, is failing https://buildkite.com/julialang/julia-master/builds/11178#4c047e50-b0fd-4c39-836f-33e9d815c074:

/Users/administrator/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-macmini-aarch64-1.0/build/default-macmini-aarch64-1-0/julialang/julia-master/src/jitlayers.cpp:669:8: error: expected value in expression
#  elif
       ^
/Users/administrator/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-macmini-aarch64-1.0/build/default-macmini-aarch64-1-0/julialang/julia-master/src/jitlayers.cpp:1039:41: error: unknown type name 'JLEHFrameRegistrar'; did you mean 'llvm::jitlink::EHFrameRegistrar'?
    auto ehRegistrar = std::make_unique<JLEHFrameRegistrar>();
                                        ^~~~~~~~~~~~~~~~~~
                                        llvm::jitlink::EHFrameRegistrar
/Users/administrator/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-macmini-aarch64-1.0/build/default-macmini-aarch64-1-0/julialang/julia-master/usr/include/llvm/ExecutionEngine/JITLink/EHFrameSupport.h:25:7: note: 'llvm::jitlink::EHFrameRegistrar' declared here
class EHFrameRegistrar {
      ^

[alexfanqi]

Sorry, my bad. It was a silly mistake.

Address comment. Use toPtr