[CIR] Failing tests with `MLIR_ENABLE_EXPENSIVE_PATTERN_API_CHECKS=ON`

[Andres-Salamanca]

When building with the CMake flag -DMLIR_ENABLE_EXPENSIVE_PATTERN_API_CHECKS=ON, two tests in the CIR dialect are currently failing. This was identified during the upstreaming process and confirmed in the incubator as well. Relevant discussion: #140649 (comment)
Failing tests:

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Failed Tests (2):
  Clang :: CIR/CodeGen/loop.cpp
  Clang :: CIR/Transforms/switch.cir
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@xlauko