Stdlib: thin AOT stream_get_contents php://memory via libc FILE* (#27437)

[PurHur]

Summary

• Thin AOT opens php://memory as libc tmpfile() (JitStreamIoKernel); fwrite/fread/rewind hit that FILE* table.
• stream_get_contents still NestedJIT'd through StreamReadJitHelper→VmFs, which cannot see those handles — binary printed '' (previously SIGSEGV on older tips).
• Force libc __compiler_stream_get_contents after NestedJIT (same pattern as fgets/fseek/ftell, Regression: AOT fscanf() compile fails — Unable to lookup phpc_round (ext/standard/scanf.c) #27663) so remaining-buffer fread matches Zend.
• Closes Regression: AOT stream_get_contents(php://memory) segfaults after build — VM/JIT match Zend (ext/standard/file.c) #27437.

php-src reference

• ext/standard/file.c — PHP_FUNCTION(stream_get_contents)
• Thin AOT memory open: tmpfile() path in JitStreamIoKernel::emitTryFopenPhpMemory (Stdlib: stream_is_local() always false — php://memory and file streams must be true (ext/standard/streams.c) #10487)

Test plan

• Issue repro ×3 AOT: compile rc=0, prints 'hi'
• Offset/length edges match Zend/VM ('he' / 'ello' / '')
• StreamReadRuntimeShrinkTest + StreamIoRuntimeShrinkTest + AotRegressionFixtureCatalogTest OK
• AOT fixture stream_get_contents_php_memory.phpt

Not covered: full ci-fast; non-seekable stream_get_contents under thin AOT (pipe) — seekable remaining-size path covers the issue repro.

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