Fix error message wording when instanceof throws.

test/webkit/instance-of-immediates-expected.txt

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 This test makes sure that instance of behaves correctly when the value, constructor, or its prototype are immediates.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
 PASS (1 instanceof 1) threw exception TypeError: Expecting a function in instanceof check, but got 1.
-PASS ({} instanceof 1) threw exception TypeError: Expecting a function in instanceof check, but got #<Object>.
-PASS (obj instanceof 1) threw exception TypeError: Expecting a function in instanceof check, but got #<Constructor>.
-PASS (1 instanceof {}) threw exception TypeError: Expecting a function in instanceof check, but got 1.
+PASS ({} instanceof 1) threw exception TypeError: Expecting a function in instanceof check, but got 1.
+PASS (obj instanceof 1) threw exception TypeError: Expecting a function in instanceof check, but got 1.
+PASS (1 instanceof {}) threw exception TypeError: Expecting a function in instanceof check, but got #<Object>.
 PASS ({} instanceof {}) threw exception TypeError: Expecting a function in instanceof check, but got #<Object>.
-PASS (obj instanceof {}) threw exception TypeError: Expecting a function in instanceof check, but got #<Constructor>.
+PASS (obj instanceof {}) threw exception TypeError: Expecting a function in instanceof check, but got #<Object>.
 PASS (1 instanceof Constructor) is false
 PASS ({} instanceof Constructor) is false
 PASS (obj instanceof Constructor) is true
 PASS (1 instanceof Constructor) is false
 PASS ({} instanceof Constructor) threw exception TypeError: Function has non-object prototype '1' in instanceof check.
 PASS (obj instanceof Constructor) threw exception TypeError: Function has non-object prototype '1' in instanceof check.
 PASS (1 instanceof Constructor) is false
 PASS ({} instanceof Constructor) is false
 PASS (obj instanceof Constructor) is false
 PASS (1 instanceof Constructor) is false
 PASS ({} instanceof Constructor) threw exception TypeError: Function has non-object prototype 'null' in instanceof check.
 PASS (obj instanceof Constructor) threw exception TypeError: Function has non-object prototype 'null' in instanceof check.
 PASS successfullyParsed is true
 
 TEST COMPLETE