[llvm] [MC][x86] Allow non-MCTargetExpr RHS when the LHS of a MCBinaryExpr is MCTargetExpr (PR #75693)

[Chenyang Gao via llvm-commits]

cygao90 wrote:

```
--
  | MLIR :: python/dialects/affine.py
  | MLIR :: python/dialects/amdgpu.py
  | MLIR :: python/dialects/arith_dialect.py
  | MLIR :: python/dialects/builtin.py
  | MLIR :: python/dialects/cf.py
  | MLIR :: python/dialects/complex_dialect.py
  | MLIR :: python/dialects/func.py
  | MLIR :: python/dialects/linalg/opdsl/arguments.py
  | MLIR :: python/dialects/linalg/opdsl/assignments.py
  | MLIR :: python/dialects/linalg/opdsl/doctests.py
  | MLIR :: python/dialects/linalg/opdsl/emit_convolution.py
  | MLIR :: python/dialects/linalg/opdsl/emit_fill.py
  | MLIR :: python/dialects/linalg/opdsl/emit_matmul.py
  | MLIR :: python/dialects/linalg/opdsl/emit_misc.py
  | MLIR :: python/dialects/linalg/opdsl/emit_pooling.py
  | MLIR :: python/dialects/linalg/opdsl/metadata.py
  | MLIR :: python/dialects/linalg/opdsl/shape_maps_iteration.py
  | MLIR :: python/dialects/linalg/opdsl/test_core_named_ops.py
  | MLIR :: python/dialects/linalg/ops.py
  | MLIR :: python/dialects/math_dialect.py
  | MLIR :: python/dialects/memref.py
  | MLIR :: python/dialects/ml_program.py
  | MLIR :: python/dialects/nvgpu.py
  | MLIR :: python/dialects/nvvm.py
  | MLIR :: python/dialects/ods_helpers.py
  | MLIR :: python/dialects/pdl_ops.py
  | MLIR :: python/dialects/python_test.py
  | MLIR :: python/dialects/quant.py
  | MLIR :: python/dialects/scf.py
  | MLIR :: python/dialects/shape.py
  | MLIR :: python/dialects/tensor.py
  | MLIR :: python/dialects/transform.py
  | MLIR :: python/dialects/transform_bufferization_ext.py
  | MLIR :: python/dialects/transform_structured_ext.py
  | MLIR :: python/dialects/vector.py
  | MLIR :: python/ir/array_attributes.py
  | MLIR :: python/ir/attributes.py
  | MLIR :: python/ir/blocks.py
  | MLIR :: python/ir/builtin_types.py
  | MLIR :: python/ir/diagnostic_handler.py
  | MLIR :: python/ir/dialects.py
  | MLIR :: python/ir/location.py
  | MLIR :: python/ir/operation.py
  | MLIR :: python/ir/symbol_table.py
  | MLIR :: python/ir/value.py
  | MLIR :: python/pass_manager.py
```
Seems unrelated.

https://github.com/llvm/llvm-project/pull/75693