Commit ea121a2

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Add an additional test for concat_function for non-interned strings

This tests for the case where result == op1, op1 != op2 and op1_string and op2_string are non-interned strings that are equal.

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	`1`	`+--TEST--`
	`2`	`+Test concatenating a class instance that has __toString with itself that uses a non-interned string`
	`3`	`+--FILE--`
	`4`	`+<?php`
	`5`	`+$global_non_interned_string = str_repeat("a", 3);`
	`6`	`+`
	`7`	`+class Test {`
	`8`	`+ public function __toString() {`
	`9`	`+ global $global_non_interned_string;`
	`10`	`+ return $global_non_interned_string;`
	`11`	`+ }`
	`12`	`+}`
	`13`	`+`
	`14`	`+$test1 = new Test;`
	`15`	`+$test2 = new Test;`
	`16`	`+$test1 .= $test2;`
	`17`	`+`
	`18`	`+echo $test1 . "\n";`
	`19`	`+?>`
	`20`	`+--EXPECT--`
	`21`	`+aaaaaa`

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