[llvm] [GlobalISel] Diagnose inline assembly constraint lowering errors (PR #135782)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,31 @@
+; RUN: not llc -mtriple=amdgcn -mcpu=fiji -O0 -global-isel -global-isel-abort=2 -pass-remarks-missed='gisel*' %s -o - 2>&1 | FileCheck %s
+
+; CHECK: error: invalid constraint '': aggregate input operands not supported yet
+define amdgpu_kernel void @aggregates([4 x i8] %val) {
+  tail call void asm sideeffect "s_nop", "r"([4 x i8] %val)
+  ret void
+}
+
+; CHECK: error: invalid constraint '{s999}': could not allocate output register for constraint
+define amdgpu_kernel void @bad_output() {
+  tail call i32 asm sideeffect "s_nop", "={s999}"()
+  ret void
+}
+
+; CHECK: error: invalid constraint '{s998}': could not allocate input register for register constraint
+define amdgpu_kernel void @bad_input() {
+  tail call void asm sideeffect "s_nop", "{s998}"(i32 poison)
+  ret void
+}
+; CHECK: error: invalid constraint '{s997}': indirect register inputs are not supported yet
+define amdgpu_kernel void @indirect_input() {
+  tail call void asm sideeffect "s_nop", "*{s997}"(ptr elementtype(i32) poison)
+  ret void
+}
+
+; CHECK: error: invalid constraint 'i': unsupported constraint
+define amdgpu_kernel void @badimm() {
+  tail call void asm sideeffect "s_nop", "i"(i32 poison)
+  ret
+  void
----------------
arsenm wrote:

```suggestion
  ret void
```

https://github.com/llvm/llvm-project/pull/135782