[clang] [LLVM] Add new attribute `optdebug` to optimize for debugging (PR #66632)

[Arthur Eubanks via cfe-commits]

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@@ -1085,6 +1085,7 @@ The integer codes are mapped to well-known attributes as follows.
 * code 77: ``elementtype``
 * code 78: ``disable_sanitizer_instrumentation``
 * code 79: ``nosanitize_bounds``
+* code 88: ``optdebug``
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aeubanks wrote:

if you're going to update this, can you first add the attributes in between?

https://github.com/llvm/llvm-project/pull/66632