[all-commits] [llvm/llvm-project] ebc330: Improve error message for cmake failure (#71404)

[Jeremy Kun via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ebc3302725350c44aaf5f97ce7ba484e30b3efa8
      https://github.com/llvm/llvm-project/commit/ebc3302725350c44aaf5f97ce7ba484e30b3efa8
  Author: Jeremy Kun <2467754+j2kun at users.noreply.github.com>
  Date:   2023-11-07 (Tue, 07 Nov 2023)

  Changed paths:
    M llvm/cmake/modules/LLVMProcessSources.cmake

  Log Message:
  -----------
  Improve error message for cmake failure (#71404)

I ran into this error as a newbie, was educated
[here](https://discord.com/channels/636084430946959380/642426447167881246/1171016269387018310).
Updating the error message to be more descriptive about the problem and
my options.