[clang] [clang-tools-extra] [compiler-rt] [libcxx] [lld] [lldb] [llvm] [mlir] Fix SyntaxWarning messages from python 3.12 (PR #86806)

[Florian Mayer via cfe-commits]

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fmayer wrote:

LGTM, verified the two strings are the same

```
>>> r"^(.*) \(in (.*)\) \((.*:\d*)\)$" == "^(.*) \(in (.*)\) \((.*:\d*)\)$"
True
>>> "^( *#([0-9]+) *)(0x[0-9a-f]+) *(?:in *.+)? *\((.*)\+(0x[0-9a-f]+)\)" == r"^( *#([0-9]+) *)(0x[0-9a-f]+) *(?:in *.+)? *\((.*)\+(0x[0-9a-f]+)\)"
```

https://github.com/llvm/llvm-project/pull/86806