[llvm-bugs] [Bug 132491] [CIR] Upstream support for switch statements

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Issue	132491
Summary	[CIR] Upstream support for switch statements
Labels	new issue
Assignees
Reporter	andykaylor

    ### Overview
Upstream support for switch statements and the cir.switch and cir.case operations.

### Suggested minimal test case
```
int f(int a) {
  switch (a) {
    case 0: return 10;
    case 1: return 20;
    default: return 30;
  }
}
```

Note: The cir.break statement will be upstreamed as part of https://github.com/llvm/llvm-project/issues/132490. Please wait for that to avoid duplicate work. The upstreaming of switch statements without break statements can be handled independently.

### Existing incubator tests
clang/test/CIR/CodeGen/switch.cpp

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