[clang] [clang-tools-extra] [test] A few tests fail in debug and need to be marked UNSUPPORTED (PR #208548)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> A few clang tests stack overflow with a debug clang. Copy the debug lit feature from LLVM and mark the crashing tests unsupported in debug.

When did this behavior start? I'm worried this is papering over real issues if these failures are a recent thing. I'm particularly worried about the codegen test for deducing this -- I don't see what in that test should cause problematic amounts of overhead.

FWIW, I exclusively use debug builds of Clang and I do not see any of these failures (but I routinely see one on template instantiation depths). 

https://github.com/llvm/llvm-project/pull/208548