[llvm-bugs] [Bug 159295] [MLIR][SPIR-V] Null pointer dereference in type attribute handling while function call processing

[LLVM Bugs via llvm-bugs]

Issue	159295
Summary	[MLIR][SPIR-V] Null pointer dereference in type attribute handling while function call processing
Labels	mlir
Assignees
Reporter	sairam2661

    Test commit: [5a86dc996c26299de63effc927075dcbfb924167](https://github.com/llvm/llvm-project/pull/157520/commits/5a86dc996c26299de63effc927075dcbfb924167)

**Description**:
`mlir-opt` ends up triggering undefined behavior (null pointer dereference) when processing SPIR-V module with function calls and custom attributes (detected by UndefinedBehaviorSanitizer)

**Steps to reproduce**
- Minimal MLIR program (test.mlir)
```
"builtin.module"() ({
  "spirv.module"() <{
 addressing_model = #spirv.addressing_model<Logical>,
    memory_model = #spirv.memory_model<GLSL450>
  }> ({
    "spirv.func"() <{
 function_control = #spirv.function_control<None>,
      function_type = (f32) -> f32,
      sym_name = "bar"
    }> ({
    ^bb0(%arg0: f32):
 %0 = "spirv.FunctionCall"(%arg0) <{callee = @foo}> : (f32) -> f32
 "spirv.ReturnValue"(%0) : (f32) -> ()
    }) : () -> ()
 "spirv.func"() <{
      function_control = #spirv.function_control<None>,
      message = "2nd parent",
 sym_name = "foo"
    }> ({
    ^bb0(%arg0: f32):
 "spirv.ReturnValue"(%arg0) : (f32) -> ()
    }) : () -> ()
  }) : () -> ()
}) : () -> ()
```

**Command**:
```
mlir-opt test.mlir
```

**Output**:
```
/workdir/llvm-project/build/tools/mlir/include/mlir/IR/BuiltinAttributes.cpp.inc:735:21: runtime error: member access within null pointer of type 'mlir::detail::StorageUserBase<mlir::TypeAttr, mlir::Attribute, mlir::detail::TypeAttrStorage, mlir::detail::AttributeUniquer>::ImplType' (aka 'mlir::detail::TypeAttrStorage')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /workdir/llvm-project/build/tools/mlir/include/mlir/IR/BuiltinAttributes.cpp.inc:735:21 in
```

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