fix(toJson): suppress toJson exceptions in core functions that prepare error messages for user

Makes use of suppressExceptions option parameter in toJson function.

Closes angular#9838

Author: kwypchlo

src/minErr.js

@@ -59,7 +59,7 @@ function minErr(module, ErrorConstructor) {
         } else if (typeof arg === 'undefined') {
           return 'undefined';
         } else if (typeof arg !== 'string') {
-          return toJson(arg);
+          return toJson(arg, false, {suppressExceptions: true});
         }
         return arg;
       }

src/ng/directive/ngRepeat.js

@@ -366,7 +366,7 @@ var ngRepeatDirective = ['$parse', '$animate', function($parse, $animate) {
               });
               throw ngRepeatMinErr('dupes',
                   "Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys. Repeater: {0}, Duplicate key: {1}, Duplicate value: {2}",
-                  expression, trackById, toJson(value));
+                  expression, trackById, toJson(value, false, {suppressExceptions: true}));
             } else {
               // new never before seen block
               nextBlockOrder[index] = {id: trackById, scope: undefined, clone: undefined};

src/ng/rootScope.js

@@ -776,7 +776,8 @@ function $RootScopeProvider() {
                         logMsg = (isFunction(watch.exp))
                             ? 'fn: ' + (watch.exp.name || watch.exp.toString())
                             : watch.exp;
-                        logMsg += '; newVal: ' + toJson(value) + '; oldVal: ' + toJson(last);
+                        logMsg += '; newVal: ' + toJson(value, false, {suppressExceptions: true}) +
+                            '; oldVal: ' + toJson(last, false, {suppressExceptions: true});
                         watchLog[logIdx].push(logMsg);
                       }
                     } else if (watch === lastDirtyWatch) {
@@ -810,7 +811,7 @@ function $RootScopeProvider() {
             throw $rootScopeMinErr('infdig',
                 '{0} $digest() iterations reached. Aborting!\n' +
                 'Watchers fired in the last 5 iterations: {1}',
-                TTL, toJson(watchLog));
+                TTL, toJson(watchLog, false, {suppressExceptions: true}));
           }
 
         } while (dirty || asyncQueue.length);