Integrate LLVM at llvm/llvm-project@6da63573e483
Integrate LLVM at llvm/llvm-project@6da63573e483

Updates LLVM usage to match
[6da63573e483](https://github.com/llvm/llvm-project/commit/6da63573e483)

PiperOrigin-RevId: 407562781
Change-Id: I35bb0530f4984403c1c88d904c93f8a54999d42b

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