Print log/error messages on stderr, not stdout

There are a couple of places where libc++ prints log/error messages to
stdout on its own. This may of course interfere with the output
generated with applications. Log/error messages should be directed to
stderr instead.

Differential Revision:	http://reviews.llvm.org/D8135
Reviewed by:	marshall

llvm-svn: 231767
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: c19393c758e0e7d24fa39ef00c8a6a7beeb731ad
diff --git a/src/exception.cpp b/src/exception.cpp
index b5c46c0..07983ce 100644
--- a/src/exception.cpp
+++ b/src/exception.cpp
@@ -90,14 +90,14 @@
 #endif  // _LIBCPP_NO_EXCEPTIONS
         (*get_terminate())();
         // handler should not return
-        printf("terminate_handler unexpectedly returned\n");
+        fprintf(stderr, "terminate_handler unexpectedly returned\n");
         ::abort();
 #ifndef _LIBCPP_NO_EXCEPTIONS
     }
     catch (...)
     {
         // handler should not throw exception
-        printf("terminate_handler unexpectedly threw an exception\n");
+        fprintf(stderr, "terminate_handler unexpectedly threw an exception\n");
         ::abort();
     }
 #endif  // _LIBCPP_NO_EXCEPTIONS
@@ -117,7 +117,7 @@
 #   else
 #       warning uncaught_exception not yet implemented
 #   endif
-    printf("uncaught_exception not yet implemented\n");
+    fprintf(stderr, "uncaught_exception not yet implemented\n");
     ::abort();
 #endif  // __APPLE__
 }
@@ -190,7 +190,7 @@
 #   else
 #       warning exception_ptr not yet implemented
 #   endif
-    printf("exception_ptr not yet implemented\n");
+    fprintf(stderr, "exception_ptr not yet implemented\n");
     ::abort();
 #endif
 }
@@ -209,7 +209,7 @@
 #   else
 #       warning exception_ptr not yet implemented
 #   endif
-    printf("exception_ptr not yet implemented\n");
+    fprintf(stderr, "exception_ptr not yet implemented\n");
     ::abort();
 #endif
 }
@@ -234,7 +234,7 @@
 #   else
 #       warning exception_ptr not yet implemented
 #   endif
-    printf("exception_ptr not yet implemented\n");
+    fprintf(stderr, "exception_ptr not yet implemented\n");
     ::abort();
 #endif
 }
@@ -278,7 +278,7 @@
 #   else
 #       warning exception_ptr not yet implemented
 #   endif
-    printf("exception_ptr not yet implemented\n");
+    fprintf(stderr, "exception_ptr not yet implemented\n");
     ::abort();
 #endif
 }
@@ -300,7 +300,7 @@
 #   else
 #       warning exception_ptr not yet implemented
 #   endif
-    printf("exception_ptr not yet implemented\n");
+    fprintf(stderr, "exception_ptr not yet implemented\n");
     ::abort();
 #endif
 }