Cleanup header simulator

Author: steakhal

clang/test/Analysis/Inputs/system-header-simulator-cxx-std-locks.h

@@ -1,17 +1,13 @@
-// This is a fake system header with divide-by-zero bugs introduced in
-// c++ std library functions. We use these bugs to test hard-coded
-// suppression of diagnostics within standard library functions that are known
-// to produce false positives.
-
 #pragma clang system_header
+
 namespace std {
 struct mutex {
-  void lock() {}
-  void unlock() {}
+  void lock();
+  void unlock();
 };
 
 template <typename T> struct lock_guard {
-  lock_guard<T>(std::mutex) {}
-  ~lock_guard<T>() {}
+  lock_guard(std::mutex &);
+  ~lock_guard();
 };
 } // namespace std