[llvm-bugs] [Bug 160376] [CIR] Upstream support for dynamic cast

[LLVM Bugs via llvm-bugs]

Issue	160376
Summary	[CIR] Upstream support for dynamic cast
Labels	ClangIR
Assignees
Reporter	andykaylor

    ### Overview
Upstream support for compare expressions and the cir.cmp operation.

### Suggested minimal test case
```
struct Base {
  virtual void f();
};

struct Derived : Base {};

Derived *ptr_cast(Base *b) {
 return dynamic_cast<Derived *>(b);
}
```

### Existing incubator tests
clang/test/CIR/CodeGen/dynamic-cast.cpp
clang/test/CIR/CodeGen/dynamic-cast-relative-layout.cpp
clang/test/CIR/CodeGen/dynamic-cast-exact.cpp

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