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Thanks so much for making this happen. I have written many, many clang test cases with convoluted FileCheck regexes that match "label:" and "; :" so they pass with and without NDEBUG.

On Fri, Feb 22, 2019 at 7:34 AM James Y Knight via llvm-dev <llvm-dev@lists.llvm.org> wrote:

After watching a few different people get confused about nameless blocks in llvm IR, and recalling my own confusion a few years ago, I'd like to change the syntax slightly to make it a bit clearer.

This is similar to the change made for instruction names in https://llvm.org/PR2480 a decade ago.

Two changes:
1\. Change the parsing of a numeric block label to parse as a value number rather than a string.
2\. When printing blocks, always print the value number as a proper label, except for the initial block.

See proposed change in https://reviews.llvm.org/D58548

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