Oss-fuzz ideal integration (#1262)

* Fix watchpoint leak in ARM

* Builds fuzz targets with sanitizer support

* Builds fuzz targets with directory driver

* Adds script to dowlonad public corpus

* Adds CIfuzz

To checks Pull Requests with fuzzing

* Use static library for fuzz targets

* Less verbose logs for fuzz driver directory

tests/fuzz/dlcorpus.sh

@@ -0,0 +1,11 @@
+#/bin/sh
+#change to script directory
+cd `dirname $0`
+ls fuzz_emu*.c | sed 's/.c//' | while read target
+do
+    #download public corpus
+    wget "https://storage.googleapis.com/unicorn-backup.clusterfuzz-external.appspot.com/corpus/libFuzzer/unicorn_$target/public.zip"
+    unzip -q public.zip -d corpus_$target
+    #run target on corpus
+    ./$target corpus_$target
+done