[clang] [CIR] Upstream a batch of passing tests from CIR-Incubator (PR #157333)

[Burhan Söğüt via cfe-commits]

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bursot wrote:

@Andres-Salamanca Is these need to change CHECK-CIR. It is written in LLVM IR because.
clang/test/CIR/Lowering/nested-switch.cpp
clang/test/CIR/Lowering/switch-while.c
clang/test/CIR/hello.c 

https://github.com/llvm/llvm-project/pull/157333