[clang] [llvm] [CUDA/HIP][SYCL] Deduplicate deferred diagnostics across multiple callers (PR #185926)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/include/clang/Sema/SemaCUDA.h clang/lib/Sema/Sema.cpp clang/test/OpenMP/nvptx_unsupported_type_messages.cpp clang/test/SemaSYCL/sycl-kernel-entry-point-attr-device-odr-use.cpp --diff_from_common_commit
``````````

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in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/Sema.cpp b/clang/lib/Sema/Sema.cpp
index f13781498..85038b0ac 100644
--- a/clang/lib/Sema/Sema.cpp
+++ b/clang/lib/Sema/Sema.cpp
@@ -1988,10 +1988,9 @@ public:
     if (Caller) {
       auto &Callers = S.CUDA().DeviceKnownEmittedFns[FD];
       CanonicalDeclPtr<const FunctionDecl> CanonCaller(Caller);
-      if (llvm::none_of(Callers,
-                        [CanonCaller](const auto &C) {
-                          return C.FD == CanonCaller;
-                        }))
+      if (llvm::none_of(Callers, [CanonCaller](const auto &C) {
+            return C.FD == CanonCaller;
+          }))
         Callers.push_back({Caller, Loc});
     }
     if (ShouldEmitRootNode || InOMPDeviceContext)

``````````

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https://github.com/llvm/llvm-project/pull/185926