[libFuzer] Roll libFuzzer eebc6eb..a746f0e.

https://chromium.googlesource.com/chromium/llvm-project/llvm/lib/Fuzzer/+log/eebc6eb..a746f0e

TBR=aizatsky@chromium.org, inferno@chromium.org, ochang@chromium.org
BUG=539572

Review-Url: https://codereview.chromium.org/2753063002
Cr-Commit-Position: refs/heads/master@{#457480}

DEPS

@@ -100,7 +100,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libFuzzer
   # and whatever else without interference from each other.
-  'libfuzzer_revision': 'eebc6eb55995a29173f269baf071046fcd2e0f4b',
+  'libfuzzer_revision': 'a746f0ef810637b40784e808bad49aa2ef1bde8b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling devtools-node-modules
   # and whatever else without interference from each other.