build: patch PHP 8.5 to disable preserve_none under ASan

preserve_none + -fsanitize=address crashes clang 19+ on x86-64
(llvm/llvm-project#95928). Apply a patch at source-tree build time
that guards ZEND_PRESERVE_NONE with __has_feature(address_sanitizer),
following the fix pattern from llvm-project commit 996157c.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: morrisonlevi

dockerfiles/ci/bookworm/php-8.5/0001-Disable-preserve_none-under-ASan.patch

@@ -0,0 +1,29 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Levi Morrison <levi.morrison@datadoghq.com>
+Date: Mon, 07 Apr 2026 00:00:00 +0000
+Subject: [PATCH] Disable preserve_none under ASan
+
+preserve_none combined with -fsanitize=address crashes clang 19+ on
+x86-64. Disable it when ASan is active, following the same fix applied
+in llvm-project (commit 996157c).
+
+See: https://github.com/llvm/llvm-project/issues/95928
+---
+ Zend/zend_portability.h | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/Zend/zend_portability.h b/Zend/zend_portability.h
+index 1111111..2222222 100644
+--- a/Zend/zend_portability.h
++++ b/Zend/zend_portability.h
+@@ -333,7 +333,11 @@ static zend_always_inline double _zend_get_nan(void) /* {{{ */
+
+ #ifdef HAVE_PRESERVE_NONE
+-# define ZEND_PRESERVE_NONE __attribute__((preserve_none))
++# if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
++/* preserve_none + ASan crashes clang 19+ on x86-64, see llvm/llvm-project#95928 */
++#  define ZEND_PRESERVE_NONE
++# else
++#  define ZEND_PRESERVE_NONE __attribute__((preserve_none))
++# endif
+ #endif

dockerfiles/ci/bookworm/php-8.5/Dockerfile

@@ -10,12 +10,14 @@ COPY php-8.5/suppr.txt /home/circleci/suppr.txt
 FROM --platform=$BUILDPLATFORM $BUILD_BASE AS src
 ARG phpTarGzUrl
 ARG phpSha256Hash
+COPY php-8.5/0001-Disable-preserve_none-under-ASan.patch /home/circleci
 RUN set -eux; \
     curl -fsSL -o /tmp/php.tar.gz "${phpTarGzUrl}"; \
     (echo "${phpSha256Hash} /tmp/php.tar.gz" | sha256sum -c -); \
     tar xf /tmp/php.tar.gz -C "${PHP_SRC_DIR}" --strip-components=1; \
     rm -f /tmp/php.tar.gz; \
     cd ${PHP_SRC_DIR}; \
+    git apply /home/circleci/0001-Disable-preserve_none-under-ASan.patch; \
     # We need to remove the dl() calls from run-tests as some extensions don't properly switch interned string storage for INIs. \
     sed -i 's/\bdl(/(bool)(/' run-tests.php; \
     ./buildconf --force;