[compiler-rt] [llvm] [compiler-rt] Add check-builtins target for LLVM_ENABLE_RUNTIMES builds (PR #166837)

[David Spickett via llvm-commits]

DavidSpickett wrote:

> When doing a LLVM_ENABLE_RUNTIMES-based build of clang+compiler_rt, the check-builtins target is missing and builtins tests are not run (https://github.com/llvm/llvm-project/issues/112105, https://github.com/llvm/llvm-project/issues/144090).

It's not clear to me whether this fixes the issue of the missing tests, or only moves toward fixing the issue of the missing tests.

(grateful for this change either way though!)

Please close the linked issues if this has in fact solved them.

https://github.com/llvm/llvm-project/pull/166837