LTO: make dynamic map the default

docs/Changelog.md

@@ -28,6 +28,8 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
        sancov, and also supports function matching!
      - fixes for laf-intel float splitting (thanks to mark-griffin for
        reporting)
+     - LTO: switch default to the dynamic memory map, set AFL_LLVM_MAP_ADDR
+            for a fixed map address (eg. 0x10000)
      - LTO: autodictionary mode is a default
      - LTO: instrim instrumentation disabled, only classic support used
             as it is always better