Doxygenize the documentation comments

src/IceRegAlloc.h

Index: src/IceRegAlloc.h
diff --git a/src/IceRegAlloc.h b/src/IceRegAlloc.h
index 1658a7d4d97e27468ce1e183929e681f00fd5d2f..0fb994fe6cd466f0004bb8a6e7aa8955810fa869 100644
--- a/src/IceRegAlloc.h
+++ b/src/IceRegAlloc.h
@@ -38,12 +38,12 @@ private:
 
   void initForGlobal();
   void initForInfOnly();
-  // Move an item from the From set to the To set.  From[Index] is
-  // pushed onto the end of To[], then the item is efficiently removed
-  // from From[] by effectively swapping it with the last item in
-  // From[] and then popping it from the back.  As such, the caller is
-  // best off iterating over From[] in reverse order to avoid the need
-  // for special handling of the iterator.
+  /// Move an item from the From set to the To set.  From[Index] is
+  /// pushed onto the end of To[], then the item is efficiently removed
+  /// from From[] by effectively swapping it with the last item in
+  /// From[] and then popping it from the back.  As such, the caller is
+  /// best off iterating over From[] in reverse order to avoid the need
+  /// for special handling of the iterator.
   void moveItem(UnorderedRanges &From, SizeT Index, UnorderedRanges &To) {
     To.push_back(From[Index]);
     From[Index] = From.back();
@@ -52,8 +52,8 @@ private:
 
   Cfg *const Func;
   OrderedRanges Unhandled;
-  // UnhandledPrecolored is a subset of Unhandled, specially collected
-  // for faster processing.
+  /// UnhandledPrecolored is a subset of Unhandled, specially collected
+  /// for faster processing.
   OrderedRanges UnhandledPrecolored;
   UnorderedRanges Active, Inactive, Handled;
   std::vector<InstNumberT> Kills;