Update CPython 3.14a3 -> 3.14a4 (astral-sh#493)

Author: zanieb

cpython-unix/build-cpython.sh

@@ -284,11 +284,17 @@ if [ -n "${PYTHON_MEETS_MINIMUM_VERSION_3_11}" ]; then
 fi
 
 if [ -n "${PYTHON_MEETS_MINIMUM_VERSION_3_12}" ]; then
-    # Adjust BOLT flags to yield better behavior. See inline details in patch.
-    patch -p1 -i ${ROOT}/patch-configure-bolt-flags.patch
+    # On 3.14+, we upstreamed these changes and they are no longer needed
+    if [ -n "${PYTHON_MEETS_MAXIMUM_VERSION_3_13}" ]; then
+        # Adjust BOLT flags to yield better behavior. See inline details in patch.
+        patch -p1 -i ${ROOT}/patch-configure-bolt-flags.patch
 
-    # Adjust BOLT application flags to make use of modern LLVM features.
-    patch -p1 -i ${ROOT}/patch-configure-bolt-apply-flags.patch
+        # Adjust BOLT application flags to make use of modern LLVM features.
+        patch -p1 -i ${ROOT}/patch-configure-bolt-apply-flags.patch
+    else
+        # We are still upstreaming some additional optimization flags
+        patch -p1 -i ${ROOT}/patch-configure-bolt-apply-flags-3.14.patch
+    fi
 fi
 
 # The optimization make targets are both phony and non-phony. This leads

cpython-unix/patch-configure-bolt-apply-flags-3.14.patch

@@ -0,0 +1,22 @@
+diff --git a/configure.ac b/configure.ac
+index ee034e5a962..f1a69b7d4a7 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -2183,8 +2183,9 @@ then
+     [m4_normalize("
+      -update-debug-sections
+      -reorder-blocks=ext-tsp
+      -reorder-functions=cdsort
+      -split-functions
++     -split-strategy=cdsplit
+      -icf=1
+      -inline-all
+      -split-eh
+@@ -2196,6 +2197,7 @@ then
+      -dyno-stats
+      -use-gnu-stack
+      -frame-opt=hot
++     -hugify
+    ")]
+   )
+ fi

pythonbuild/downloads.py

@@ -80,10 +80,10 @@
         "python_tag": "cp313",
     },
     "cpython-3.14": {
-        "url": "https://www.python.org/ftp/python/3.14.0/Python-3.14.0a3.tar.xz",
-        "size": 22749680,
-        "sha256": "94349df207456a575a8867c20b4ca434f870e1920dcdcc8fdf797e1af49abe90",
-        "version": "3.14.0a3",
+        "url": "https://www.python.org/ftp/python/3.14.0/Python-3.14.0a4.tar.xz",
+        "size": 22798932,
+        "sha256": "c24f07881873c1d460228795ca6ca8c99130e30c773c91463d30d7ea8ff0e70b",
+        "version": "3.14.0a4",
         "licenses": ["Python-2.0", "CNRI-Python"],
         "license_file": "LICENSE.cpython.txt",
         "python_tag": "cp314",