[clang][dataflow] Remove a redundant trailing semicolon. NFC.

This silences the following warning with GCC:

    llvm-project/llvm/tools/clang/unittests/Analysis/FlowSensitive/TypeErasedDataflowAnalysisTest.cpp:89:4: warning: extra ‘;’ [-Wpedantic]
       89 |   };
          |    ^
          |    -

Author: mstorsjo

clang/unittests/Analysis/FlowSensitive/TypeErasedDataflowAnalysisTest.cpp

@@ -86,7 +86,7 @@ class DataflowAnalysisTest : public Test {
     const std::optional<StateT> &MaybeState = BlockStates[Block->getBlockID()];
     assert(MaybeState.has_value());
     return *MaybeState;
-  };
+  }
 
   std::unique_ptr<ASTUnit> AST;
   std::unique_ptr<ControlFlowContext> CFCtx;