Add Emacs hints to Alarm.inc.

Also removes some trailing whitespace and fixes one 80-column violation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64094 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Win32/Alarm.inc b/lib/System/Win32/Alarm.inc
index be23bf6..2f1a280 100644
--- a/lib/System/Win32/Alarm.inc
+++ b/lib/System/Win32/Alarm.inc
@@ -1,4 +1,4 @@
-//===-- Alarm.inc - Implement Win32 Alarm Support -------------------------===//
+//===-- Alarm.inc - Implement Win32 Alarm Support ---------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -14,7 +14,7 @@
 #include <cassert>
 using namespace llvm;
 
-/// NestedSOI - Sanity check.  Alarms cannot be nested or run in parallel.  
+/// NestedSOI - Sanity check.  Alarms cannot be nested or run in parallel.
 /// This ensures that they never do.
 static bool NestedSOI = false;