build-llvm.py: Update to latest mainline release

Signed-off-by: Nathan Chancellor <nathan@kernel.org>

Author: nathanchance

build-llvm.py

@@ -444,7 +444,7 @@
                 f"Supplied kernel source version ('{found_version}') is older than the minimum required version ('{minimum_version}'), provide a newer version!"
             )
     else:
-        lsm.location = Path(src_folder, 'linux-6.14')
+        lsm.location = Path(src_folder, 'linux-6.15-rc2')
         lsm.patches = list(src_folder.glob('*.patch'))
 
         lsm.tarball.base_download_url = 'https://git.kernel.org/torvalds/t'

src/arm-avoid-__read_overflow.patch

@@ -0,0 +1,20 @@
+diff --git a/drivers/net/wireless/intel/iwlwifi/mld/d3.c b/drivers/net/wireless/intel/iwlwifi/mld/d3.c
+index 5a7207accd86..1e0c4ea3802c 100644
+--- a/drivers/net/wireless/intel/iwlwifi/mld/d3.c
++++ b/drivers/net/wireless/intel/iwlwifi/mld/d3.c
+@@ -20,6 +20,7 @@
+ #include <net/ipv6.h>
+ #include <net/addrconf.h>
+ #include <linux/bitops.h>
++#include <linux/unroll.h>
+ 
+ /**
+  * enum iwl_mld_d3_notif - d3 notifications
+@@ -1754,6 +1755,7 @@ iwl_mld_send_proto_offload(struct iwl_mld *mld,
+ 
+ 		addrconf_addr_solict_mult(&wowlan_data->target_ipv6_addrs[i],
+ 					  &solicited_addr);
++		unrolled_none
+ 		for (j = 0; j < c; j++)
+ 			if (ipv6_addr_cmp(&nsc[j].dest_ipv6_addr,
+ 					  &solicited_addr) == 0)