Rename RunCallBacksToRun to llvm::sys::RunSignalHandlers

And expose it in Signals.h, allowing clients to call it directly,
possibly LLVMErrorHandler which currently calls RunInterruptHandlers
but not RunSignalHandlers, thus for example not printing the stack
backtrace on Unixish OSes. On Windows it does happen because
RunInterruptHandlers ends up calling the callbacks as well via 
Cleanup(). This difference in behaviour and code structures in
*/Signals.inc should be patched in the future.

llvm-svn: 242936

include/llvm/Support/Signals.h

@@ -47,6 +47,9 @@ namespace sys {
   /// \brief Print the stack trace using the given \c raw_ostream object.
   void PrintStackTrace(raw_ostream &OS);
 
+  // Run all registered signal handlers.
+  void RunSignalHandlers();
+
   /// AddSignalHandler - Add a function to be called when an abort/kill signal
   /// is delivered to the process.  The handler can have a cookie passed to it
   /// to identify what instance of the handler it is.

lib/Support/Signals.cpp

@@ -28,7 +28,7 @@ using namespace sys;
 
 static ManagedStatic<std::vector<std::pair<void (*)(void *), void *>>>
     CallBacksToRun;
-void RunCallBacksToRun() {
+void sys::RunSignalHandlers() {
   if (!CallBacksToRun.isConstructed())
     return;
   for (auto &I : *CallBacksToRun)

lib/Support/Unix/Signals.inc

@@ -201,7 +201,7 @@ static RETSIGTYPE SignalHandler(int Sig) {
   }
 
   // Otherwise if it is a fault (like SEGV) run any handler.
-  RunCallBacksToRun();
+  llvm::sys::RunSignalHandlers();
 
 #ifdef __s390__
   // On S/390, certain signals are delivered with PSW Address pointing to

lib/Support/Windows/Signals.inc

@@ -457,7 +457,7 @@ static void Cleanup() {
       llvm::sys::fs::remove(FilesToRemove->back());
       FilesToRemove->pop_back();
     }
-  RunCallBacksToRun();
+  llvm::sys::RunSignalHandlers();
   LeaveCriticalSection(&CriticalSection);
 }