Fix #66084: whitespace depending iteration over SimpleXMLElements

[cmb69]

This patch is supposed to solve whitespace depending irregularities when iterating over SimpleXMLElements where sxe.iter_type == SXE_ITER_NONE. The faulty behavior may affect var_dump, print_r, json_encode, etc.

Of course, the patch addresses the duplicates #62639, #67116, #69169, #69491, #61335 and #67572 as well; nonetheless there are separate tests included, based on the respective test scripts, for each of the mentionend reports. Tests for #66084 had already been merged.

I've tested the patch on Windows 7 (libxml2 2.9.2) and Ubuntu 14.04 LTS (libxml2 2.7.7, 2.7.8, 2.8.0, 2.9.1 and 2.9.2) with PHP 5.5.25, PHP 5.6.9 and master (7dac4d4). Before applying the actual patch the 6 new tests failed; after applying the patch all tests in ext/simplexml/tests passed,except very few tests which also did not pass without the patch: SimpleXMLElement_xpath.phpt and bug37565.phpt on Windows with PHP 5, and SimpleXMLElement_xpath.phpt on Ubuntu (skipped due to requiring 32-bit build) with master.

It has to be noted that commit 18f9589 is not relevant for PHP 5, but only for current master.

[php-pulls]

Comment on behalf of ab at php.net:

Thanks, merged in master. To be backported into 5.5 and 5.6