[cleanup] Bring back comment lost in refactoring.

R=cbruni@chromium.org
BUG=v8:6474

Change-Id: I84be45bab041082cc66b5fdd70a9e799a44facee
Reviewed-on: https://chromium-review.googlesource.com/529207Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45819}

src/objects.h

@@ -3090,9 +3090,10 @@ template <SearchMode search_mode, typename T>
 inline int Search(T* array, Name* name, int valid_entries = 0,
                   int* out_insertion_index = NULL);
 
-// The cache for maps used by normalized (dictionary mode) objects.
-// Such maps do not have property descriptors, so a typical program
-// needs very limited number of distinct normalized maps.
+// HandlerTable is a fixed array containing entries for exception handlers in
+// the code object it is associated with. The tables comes in two flavors:
+// 1) Based on ranges: Used for unoptimized code. Contains one entry per
+//    exception handler and a range representing the try-block covered by that
 //    handler. Layout looks as follows:
 //      [ range-start , range-end , handler-offset , handler-data ]
 // 2) Based on return addresses: Used for turbofanned code. Contains one entry