Revert "Properly update string type flags"

This reverts commit 99b1a62.

Author: dstogov

Zend/zend_variables.c

@@ -219,13 +219,6 @@ ZEND_API void ZEND_FASTCALL _zval_copy_ctor_func(zval *zvalue ZEND_FILE_LINE_DC)
 {
 	if (EXPECTED(Z_TYPE_P(zvalue) == IS_ARRAY)) {
 		ZVAL_ARR(zvalue, zend_array_dup(Z_ARRVAL_P(zvalue)));
-	} else if (EXPECTED(Z_TYPE_P(zvalue) == IS_STRING)) {
-		CHECK_ZVAL_STRING_REL(Z_STR_P(zvalue));
-		ZVAL_NEW_STR(zvalue, zend_string_dup(Z_STR_P(zvalue), 0));
-	} else if (EXPECTED(Z_TYPE_P(zvalue) == IS_CONSTANT)) {
-		CHECK_ZVAL_STRING_REL(Z_STR_P(zvalue));
-		Z_STR_P(zvalue) = zend_string_dup(Z_STR_P(zvalue), 0);
-		Z_TYPE_INFO_P(zvalue) = IS_CONSTANT_EX;
 	} else if (EXPECTED(Z_TYPE_P(zvalue) == IS_STRING) ||
 	           EXPECTED(Z_TYPE_P(zvalue) == IS_CONSTANT)) {
 		CHECK_ZVAL_STRING_REL(Z_STR_P(zvalue));