php_shrink: Move add_apo_slashes to compile.php

tests/php_shrink.php

@@ -13,6 +13,9 @@ function check($code, $expected) {
 //! bugs:
 check('{if (true) {} echo 1;}', '{if(true);echo 1;}');
 
+//! inefficiencies
+check('echo "a"."b",\'c\'."d$a"."e";', 'echo "abcd$a"."e"');
+
 check('$ab = 1; echo $ab;', '$a=1;echo$a;');
 check('$ab = 1; $cd = 2;', '$a=1;$b=2;');
 check('define("AB", 1);', 'define("AB",1);');