Fix GH-23626: OPcache: orphaned temporaries cause leaks and assertions

[khaledalam]

When match has arms but constant folding proves none of them can be taken, the block pass treats MATCH_ERROR as a terminator and drops the following blocks as unreachable. Temporaries created before the match and consumed only in those blocks lose their live range, so:

• they are not freed when UnhandledMatchError unwinds (memory leak, wrong destructor order), or
• if a non-consuming use like BIND_LEXICAL remains, zend_calc_live_ranges() hits the keeps_op1_alive() assertion.

This was already handled for arm-less match by marking MATCH_ERROR as an expression throw (ZEND_THROW_IS_EXPR), which stops the CFG from treating it as a block terminator. This patch applies the marking unconditionally, as suggested by @ndossche in the issue.

Before

$ php -d opcache.enable_cli=1 leak.php
caught
done
destruct a
destruct a-clone
=== Total 1 memory leaks detected ===

$ php -d opcache.enable_cli=1 assert.php
Assertion failed: (...), function keeps_op1_alive, file zend_opcode.c, line 912.

After

$ php -d opcache.enable_cli=1 leak.php
destruct a-clone
caught
done
destruct a
  
$ php -d opcache.enable_cli=1 assert.php
ok

Output now matches running without opcache.