[clang] [C2y] Handle FP-suffixes on prefixed octals (#141230) (PR #141695)

[Naveen Seth Hanig via cfe-commits]

naveen-seth wrote:

Thanks for the review. 
In case the changes get approved, please also merge it on my behalf since I don't have commit access yet. Thank you!

https://github.com/llvm/llvm-project/pull/141695