Replace PrintStackTrace(FILE*) with PrintStackTrace(raw_ostream&)

This will be followed by a change on the clang side to update
the only user of this function with the new version.

Differential Revision: http://reviews.llvm.org/D8074
Reviewed By: Reid Kleckner

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231392 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/Signals.h

@@ -19,6 +19,8 @@
 #include <cstdio>
 
 namespace llvm {
+  class raw_ostream;
+
 namespace sys {
 
   /// This function runs all the registered interrupt handlers, including the
@@ -42,8 +44,8 @@ namespace sys {
   /// Disable all system dialog boxes that appear when the process crashes.
   void DisableSystemDialogsOnCrash();
 
-  /// \brief Print the stack trace using the given \c FILE object.
-  void PrintStackTrace(FILE *);
+  /// \brief Print the stack trace using the given \c raw_ostream object.
+  void PrintStackTrace(raw_ostream &OS);
 
   /// 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