Implement function proxies (except for their use as constructors).

src/array.js

Index: src/array.js
diff --git a/src/array.js b/src/array.js
index e6c13d9547c5f114480706f46ebd2a6d3c2bdd69..f6194a9bf46cc9f3400cd343ea0805b4558095fb 100644
--- a/src/array.js
+++ b/src/array.js
@@ -208,7 +208,7 @@ function ConvertToLocaleString(e) {
     // Call ToString if toLocaleString is not a function.
     // See issue 877615.
     var e_obj = ToObject(e);
-    if (IS_FUNCTION(e_obj.toLocaleString))
+    if (IS_SPEC_FUNCTION(e_obj.toLocaleString))
       return ToString(e_obj.toLocaleString());
     else
       return ToString(e);
@@ -730,7 +730,7 @@ function ArraySort(comparefn) {
   // In-place QuickSort algorithm.
   // For short (length <= 22) arrays, insertion sort is used for efficiency.
 
-  if (!IS_FUNCTION(comparefn)) {
+  if (!IS_SPEC_FUNCTION(comparefn)) {
     comparefn = function (x, y) {
       if (x === y) return 0;
       if (%_IsSmi(x) && %_IsSmi(y)) {
@@ -994,7 +994,7 @@ function ArrayFilter(f, receiver) {
                         ["Array.prototype.filter"]);
   }
 
-  if (!IS_FUNCTION(f)) {
+  if (!IS_SPEC_FUNCTION(f)) {
     throw MakeTypeError('called_non_callable', [ f ]);
   }
   // Pull out the length so that modifications to the length in the
@@ -1020,7 +1020,7 @@ function ArrayForEach(f, receiver) {
                         ["Array.prototype.forEach"]);
   }
 
-  if (!IS_FUNCTION(f)) {
+  if (!IS_SPEC_FUNCTION(f)) {
     throw MakeTypeError('called_non_callable', [ f ]);
   }
   // Pull out the length so that modifications to the length in the
@@ -1043,7 +1043,7 @@ function ArraySome(f, receiver) {
                         ["Array.prototype.some"]);
   }
 
-  if (!IS_FUNCTION(f)) {
+  if (!IS_SPEC_FUNCTION(f)) {
     throw MakeTypeError('called_non_callable', [ f ]);
   }
   // Pull out the length so that modifications to the length in the
@@ -1065,7 +1065,7 @@ function ArrayEvery(f, receiver) {
                         ["Array.prototype.every"]);
   }
 
-  if (!IS_FUNCTION(f)) {
+  if (!IS_SPEC_FUNCTION(f)) {
     throw MakeTypeError('called_non_callable', [ f ]);
   }
   // Pull out the length so that modifications to the length in the
@@ -1086,7 +1086,7 @@ function ArrayMap(f, receiver) {
                         ["Array.prototype.map"]);
   }
 
-  if (!IS_FUNCTION(f)) {
+  if (!IS_SPEC_FUNCTION(f)) {
     throw MakeTypeError('called_non_callable', [ f ]);
   }
   // Pull out the length so that modifications to the length in the
@@ -1231,7 +1231,7 @@ function ArrayReduce(callback, current) {
                         ["Array.prototype.reduce"]);
   }
 
-  if (!IS_FUNCTION(callback)) {
+  if (!IS_SPEC_FUNCTION(callback)) {
     throw MakeTypeError('called_non_callable', [callback]);
   }
   // Pull out the length so that modifications to the length in the
@@ -1265,7 +1265,7 @@ function ArrayReduceRight(callback, current) {
                         ["Array.prototype.reduceRight"]);
   }
 
-  if (!IS_FUNCTION(callback)) {
+  if (!IS_SPEC_FUNCTION(callback)) {
     throw MakeTypeError('called_non_callable', [callback]);
   }
   var i = ToUint32(this.length) - 1;