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/onedir.c

@@ -0,0 +1,80 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <dirent.h>
+#include <unistd.h>
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
+
+int main(int argc, char** argv)
+{
+    FILE * fp;
+    uint8_t Data[0x1000];
+    size_t Size;
+    DIR *d;
+    struct dirent *dir;
+    int r = 0;
+    int i;
+
+    if (argc != 2) {
+        return 1;
+    }
+
+    d = opendir(argv[1]);
+    if (d == NULL) {
+        printf("Invalid directory\n");
+        return 2;
+    }
+    if (chdir(argv[1]) != 0) {
+        closedir(d);
+        printf("Invalid directory\n");
+        return 2;
+    }
+
+    printf("Starting directory %s\n", argv[1]);
+    while((dir = readdir(d)) != NULL) {
+        //opens the file, get its size, and reads it into a buffer
+        if (dir->d_type != DT_REG) {
+            continue;
+        }
+        //printf("Running file %s\n", dir->d_name);
+        fflush(stdout);
+        fp = fopen(dir->d_name, "rb");
+        if (fp == NULL) {
+            r = 3;
+            break;
+        }
+        if (fseek(fp, 0L, SEEK_END) != 0) {
+            fclose(fp);
+            r = 4;
+            break;
+        }
+        Size = ftell(fp);
+        if (Size == (size_t) -1) {
+            fclose(fp);
+            r = 5;
+            break;
+        } else if (Size > 0x1000) {
+            fclose(fp);
+            continue;
+        }
+        if (fseek(fp, 0L, SEEK_SET) != 0) {
+            fclose(fp);
+            r = 7;
+            break;
+        }
+        if (fread(Data, Size, 1, fp) != 1) {
+            fclose(fp);
+            r = 8;
+            break;
+        }
+
+        //lauch fuzzer
+        LLVMFuzzerTestOneInput(Data, Size);
+        fclose(fp);
+    }
+    closedir(d);
+    printf("Ok : whole directory finished %s\n", argv[1]);
+    return r;
+}
+