`LowerExcHandlersPass` not defined in `GPUCompiler`

Seen in AllocCheck tests with julia nightly:

```
 UndefVarError: `LowerExcHandlersPass` not defined in `GPUCompiler`
  Suggestion: check for spelling errors or missing imports.
  Stacktrace:
    [1] (::GPUCompiler.var"#buildIntrinsicLoweringPipeline##6#buildIntrinsicLoweringPipeline##7")(fpm::LLVM.NewPMPassManager)
      @ GPUCompiler ~/.julia/packages/GPUCompiler/Gp8bZ/src/optim.jl:226
```
