Fix more WebKit test expectations

test/webkit/fast/js/modify-non-references-expected.txt

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-PASS function f() { g()++; } f.toString() is 'function f() { g()++; }'
-PASS function f() { g()--; } f.toString() is 'function f() { g()--; }'
-PASS function f() { ++g(); } f.toString() is 'function f() { ++g(); }'
-PASS function f() { --g(); } f.toString() is 'function f() { --g(); }'
-PASS function f() { g() = 1; } f.toString() is 'function f() { g() = 1; }'
-PASS function f() { g() += 1; } f.toString() is 'function f() { g() += 1; }'
+FAIL function f() { g()++; } f.toString() should be function f() { g()++; }. Threw exception ReferenceError: Invalid left-hand side expression in postfix operation
+FAIL function f() { g()--; } f.toString() should be function f() { g()--; }. Threw exception ReferenceError: Invalid left-hand side expression in postfix operation
+FAIL function f() { ++g(); } f.toString() should be function f() { ++g(); }. Threw exception ReferenceError: Invalid left-hand side expression in prefix operation
+FAIL function f() { --g(); } f.toString() should be function f() { --g(); }. Threw exception ReferenceError: Invalid left-hand side expression in prefix operation
+FAIL function f() { g() = 1; } f.toString() should be function f() { g() = 1; }. Threw exception ReferenceError: Invalid left-hand side in assignment
+FAIL function f() { g() += 1; } f.toString() should be function f() { g() += 1; }. Threw exception ReferenceError: Invalid left-hand side in assignment
 FAIL g()++ should throw ReferenceError: Postfix ++ operator applied to value that is not a reference.. Threw exception ReferenceError: Invalid left-hand side expression in postfix operation.
 FAIL g()-- should throw ReferenceError: Postfix -- operator applied to value that is not a reference.. Threw exception ReferenceError: Invalid left-hand side expression in postfix operation.
 FAIL ++g() should throw ReferenceError: Prefix ++ operator applied to value that is not a reference.. Threw exception ReferenceError: Invalid left-hand side expression in prefix operation.
 FAIL --g() should throw ReferenceError: Prefix -- operator applied to value that is not a reference.. Threw exception ReferenceError: Invalid left-hand side expression in prefix operation.
 FAIL g() = 1 should throw ReferenceError: Left side of assignment is not a reference.. Threw exception ReferenceError: Invalid left-hand side in assignment.
 FAIL g() += 1 should throw ReferenceError: Left side of assignment is not a reference.. Threw exception ReferenceError: Invalid left-hand side in assignment.
 PASS successfullyParsed is true
 
 TEST COMPLETE