SSA integrity verification failed when loading composer classmaps with more than 11k elements

[danog]

Description

Ping @dstogov, reproducer 13 at https://github.com/danog/jit_bugs issues an SSA integrity verification failed assertion if opcache is enabled.

PHP Version

PHP 8.2.14 (2b8c008), master

Operating System

No response

[nielsdos]

This is a false positive.
cycle in uses of 1 (CV $vendorDir)
This is because the cycle detection code stops at 10000 uses and assumes a cycle has happened:

		FOREACH_USE(var, use) {
			if (++c > 10000) {
				FAIL("cycle in uses of " VARFMT "\n", VAR(i));
				goto finish;
			}

Increase the limit or patch that out and you'll see it works.

[nielsdos]

I implemented a solution in #12954 by using a cycle detection algorithm instead of a counter.