[clang] [lldb] [llvm] [mlir] [Support] Validate number of arguments passed to formatv() (PR #105745)

[Rahul Joshi via cfe-commits]

jurahul wrote:

Looks like the CI builds are release but with LLVM_ENABLE_ASSERTION=ON, so this validation code will be enabled and potential bad usage will be flagged as well going forward as long as it's exercised during the build or test.

https://github.com/llvm/llvm-project/pull/105745