[AMDGPU] Change handling of unsupported non-compute shaders with HSA (#126798)

Previous handling in `SITargetLowering::LowerFormalArguments` only
reported a diagnostic message and continued execution by returning a
non-usable `SDValue`. This results in llvm crashing later with an
unrelated error. This commit changes the detection of an unsupported
non-compute shader to be a fatal error right away.

As an example situation, take the usage of an `amdgpu_ps` function and
the `amdgcn-unknown-amdhsa` target triple.
```
define amdgpu_ps void @foo(ptr %p, i32 %i) {
        store i32 %i, ptr %p
        ret void
}
```
Compiling this code (with `llc -mtriple=amdgcn-unknown-amdhsa
-mcpu=gfx942`, for example) fails with:
```
error: <unknown>:0:0: in function foo void (ptr, i32): unsupported non-compute shaders with HSA

llc:
[...]/git/trunk21.0/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:11790:
void llvm::SelectionDAGISel::LowerArguments(const llvm::Function&):
Assertion `InVals.size() == Ins.size() && "LowerFormalArguments didn't emit the correct number of values!"' failed.
[...]
```

0 files changed, 0 insertions, 0 deletions