[CodeGen] Remove extra ';'. NFC.

Fix compiler warning:

polly/lib/CodeGen/PerfMonitor.cpp:81:2: warning: extra ‘;’ [-Wpedantic]
 };
  ^

llvm-svn: 304802

polly/lib/CodeGen/PerfMonitor.cpp

@@ -78,7 +78,7 @@ static void TryRegisterGlobal(Module *M, const char *Name,
     *Location = new GlobalVariable(
         *M, InitialValue->getType(), true, GlobalValue::WeakAnyLinkage,
         InitialValue, Name, nullptr, GlobalVariable::InitialExecTLSModel);
-};
+}
 
 // Generate a unique name that is usable as a LLVM name for a scop to name its
 // performance counter.