[clang] [mlir] [llvm] [LLVM][IR] Replace ConstantInt's specialisation of getType() with getIntegerType(). (PR #75217)

[Paul Walker via cfe-commits]

paulwalker-arm wrote:

Turns out there was just a single extra instance, within MLIR.  It's an interesting one though and I've noted it as it looks like I'll need to extend `ModuleImport::getConstantAsAttr` as part of the patch that enables direct VectorType support for ConstantInt/FP.

https://github.com/llvm/llvm-project/pull/75217