llvm-project

ec44c74f - [CIR] Upstream support for FlattenCFG switch and SwitchFlatOp (#139154)

[CIR] Upstream support for FlattenCFG switch and SwitchFlatOp (#139154) This PR adds support for the `FlattenCFG` transformation on `switch` statements. It also introduces the `SwitchFlatOp`, which is necessary for subsequent lowering to LLVM.