[coverage] Enable sanitizer coverage.

build/coverage_wrapper.py

Index: build/coverage_wrapper.py
diff --git a/build/coverage_wrapper.py b/build/coverage_wrapper.py
index c1db754c94c1b4c323bda1551f482d007dc0fb50..5b365d8e63d911c238e5e47e276ec3649488ffc0 100755
--- a/build/coverage_wrapper.py
+++ b/build/coverage_wrapper.py
@@ -11,18 +11,26 @@ import subprocess
 import sys
 
 exclusions = [
+  'buildtools',
   'src/third_party',
   'third_party',
   'test',
   'testing',
 ]
 
+def remove_if_exists(string_list, item):
+  if item in string_list:
+    string_list.remove(item)
+
 args = sys.argv[1:]
 text = ' '.join(sys.argv[2:])
 for exclusion in exclusions:
   if re.search(r'\-o obj/%s[^ ]*\.o' % exclusion, text):
-    args.remove('-fprofile-arcs')
-    args.remove('-ftest-coverage')
+    remove_if_exists(args, '-fprofile-arcs')
+    remove_if_exists(args, '-ftest-coverage')
+    remove_if_exists(args, '-fsanitize-coverage=func')
+    remove_if_exists(args, '-fsanitize-coverage=bb')
+    remove_if_exists(args, '-fsanitize-coverage=edge')
     break
 
 sys.exit(subprocess.check_call(args))