[clang] [clang][OpenMP] Emit host diagnostics that were deferred and never flushed (PR #220316)

[via cfe-commits]

================
@@ -1127,6 +1131,13 @@ The `alpha.cplusplus.UseAfterLifetimeEnd` checker was renamed to `alpha.core.Use
   To ensure correct behavior, either use the original variable directly in the
   target region or map the bindings explicitly instead.
 
+- Fixed a host OpenMP compilation never flushing its deferred diagnostics unless an
----------------
pgerell wrote:

Fair. Merged them into a single entry under the OpenMP fixes and dropped the "Potentially Breaking Changes" one.

https://github.com/llvm/llvm-project/pull/220316