Update V8 DEPS.

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/a9a3094..5d201de

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org

Change-Id: I27cd525fb18d47ff9fcf1c60c45d251d4f36ef80
Reviewed-on: https://chromium-review.googlesource.com/484100Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44764}

DEPS

@@ -38,7 +38,7 @@ deps = {
   "v8/test/test262/harness":
     Var("chromium_url") + "/external/github.com/test262-utils/test262-harness-py.git" + "@" + "0f2acdd882c84cff43b9d60df7574a1901e2cdcd",
   "v8/tools/clang":
-    Var("chromium_url") + "/chromium/src/tools/clang.git" + "@" + "a9a30944a31d11ceedd46ee3b11e4582c25783ef",
+    Var("chromium_url") + "/chromium/src/tools/clang.git" + "@" + "5d201dec8b1eb459c3b34977c50ba6eb14705bb0",
   "v8/test/wasm-js":
     Var("chromium_url") + "/external/github.com/WebAssembly/spec.git" + "@" + "07fd6430f879d36928d179a62d9bdeed82286065",
 }