exit handlers patch instead of continuous

src/globals/patch/spc_pgo_flush_php_main.patch

@@ -0,0 +1,15 @@
+--- a/main/main.c
++++ b/main/main.c
+@@ -2563,6 +2563,12 @@
+ #endif
+
+ 	zend_observer_shutdown();
++
++	/* spc-pgo: explicit profile flush so embed/frankenphp callers that exit
++	 * via SYS_exit_group (skipping libc atexit) still get .profraw written.
++	 * Weak symbol → no-op in non-PGO builds. */
++	{ extern int __llvm_profile_write_file(void) __attribute__((weak));
++	  if (__llvm_profile_write_file) __llvm_profile_write_file(); }
+ }
+ /* }}} */
+