Add American Fuzzy Lop (afl) to third_party/afl/

third_party/afl/src/qemu_mode/patches/elfload.diff

+--- qemu-2.3.0/linux-user/elfload.c.orig        2014-12-09 14:45:42.000000000 +0000
++++ qemu-2.3.0/linux-user/elfload.c     2015-01-28 02:51:23.719000000 +0000
+@@ -28,6 +28,8 @@
+ 
+ #define ELF_OSABI   ELFOSABI_SYSV
+ 
++extern abi_ulong afl_entry_point, afl_start_code, afl_end_code;
++
+ /* from personality.h */
+ 
+ /*
+@@ -1889,6 +1891,8 @@
+     info->brk = 0;
+     info->elf_flags = ehdr->e_flags;
+ 
++    if (!afl_entry_point) afl_entry_point = info->entry;
++
+     for (i = 0; i < ehdr->e_phnum; i++) {
+         struct elf_phdr *eppnt = phdr + i;
+         if (eppnt->p_type == PT_LOAD) {
+@@ -1922,9 +1926,11 @@
+             if (elf_prot & PROT_EXEC) {
+                 if (vaddr < info->start_code) {
+                     info->start_code = vaddr;
++                    if (!afl_start_code) afl_start_code = vaddr;
+                 }
+                 if (vaddr_ef > info->end_code) {
+                     info->end_code = vaddr_ef;
++                    if (!afl_end_code) afl_end_code = vaddr_ef;
+                 }
+             }
+             if (elf_prot & PROT_WRITE) {