Add a pretty printer to improve the error message non-function calls

test/webkit/fast/js/toString-overrides-expected.txt

Index: test/webkit/fast/js/toString-overrides-expected.txt
diff --git a/test/webkit/fast/js/toString-overrides-expected.txt b/test/webkit/fast/js/toString-overrides-expected.txt
index 3e36c706157cd657144d8f6d52184408fcfc19be..cebd2652ab91e2357a0bd550b8de49f6a25ff480 100644
--- a/test/webkit/fast/js/toString-overrides-expected.txt
+++ b/test/webkit/fast/js/toString-overrides-expected.txt
@@ -28,13 +28,12 @@ On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE
 
 PASS [1].toString() is '1'
 PASS [1].toLocaleString() is 'toLocaleString'
-FAIL [1].toLocaleString() should be 1. Threw exception TypeError: string is not a function
+FAIL [1].toLocaleString() should be 1. Threw exception TypeError: (intermediate value).toLocaleString is not a function

[caitp (gmail), 2015/01/19 16:44:58]

Just my opinion, but I think `(intermediate value).toLocaleString is not a
function` feels less informative than the old error

For code like `a.b()` where b is a string, it would be nice if the error was
more like "TypeError() `a.b` (string "toLocaleString") is not a function".

 PASS [/r/].toString() is 'toString2'
 PASS [/r/].toLocaleString() is 'toLocaleString2'
-FAIL [/r/].toLocaleString() should be toString2. Threw exception TypeError: string is not a function
+FAIL [/r/].toLocaleString() should be toString2. Threw exception TypeError: (intermediate value).toLocaleString is not a function
 PASS caught is true
 PASS successfullyParsed is true
 
-
 TEST COMPLETE