Missing `LLVM_CallIntrinsicOp` support for `elementtype`

[bcardosolopes]

In order to lower ARM64 intrinsics down from ClangIR to LLVM, we found that we cannot lower to LLVM intrinsics that might need a elementtype, one example is LLVM intrinsic aarch64.ldxr, which requires elementtype.

[llvmbot]

@llvm/issue-subscribers-mlir-llvm

Author: Bruno Cardoso Lopes (bcardosolopes)

In order to lower ARM64 intrinsics down from ClangIR to LLVM, we found that we cannot lower to LLVM intrinsics that might need a `elementtype`, one example is LLVM intrinsic `aarch64.ldxr`, which requires `elementtype`.

[bcardosolopes]

For more ClangIR specific info: llvm/clangir#1070

[ghehg]

please assign this to me