Add a rustc intrinsic `amdgpu_dispatch_ptr` to access the kernel
dispatch packet on amdgpu.
The HSA kernel dispatch packet contains important information like the
launch size and workgroup size.
The Rust intrinsic lowers to the `llvm.amdgcn.dispatch.ptr` LLVM
intrinsic, which returns a `ptr addrspace(4)`, plus an addrspacecast to
`addrspace(0)`, so it can be returned as a Rust reference.
The returned pointer/reference is valid for the whole program lifetime,
and is therefore `'static`.
The return type of the intrinsic (`*const ()`) does not mention the
struct so that rustc does not need to know the exact struct type.
An alternative would be to define the struct as lang item or add a
generic argument to the function.
Short version:
```rust
#[cfg(target_arch = "amdgpu")]
pub fn amdgpu_dispatch_ptr() -> *const ();
```
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