Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/d9a25a7..9ce44b9

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/34762ec..7185692

This also ports https://chromium-review.googlesource.com/c/582976

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

Change-Id: I6436dd50b7cee016d1cc2d5f48d2d27e9025276d
Reviewed-on: https://chromium-review.googlesource.com/584171
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46855}

DEPS

@@ -8,7 +8,7 @@ vars = {
 
 deps = {
   "v8/build":
-    Var("chromium_url") + "/chromium/src/build.git" + "@" + "d9a25a7a65b3c71330e2aa2cdbb2ebd7d44357f5",
+    Var("chromium_url") + "/chromium/src/build.git" + "@" + "9ce44b99c5559f4385311405a3f7874756a5379f",
   "v8/tools/gyp":
     Var("chromium_url") + "/external/gyp.git" + "@" + "d61a9397e668fa9843c4aa7da9e79460fe590bfb",
   "v8/third_party/icu":
@@ -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" + "@" + "34762ec05836ab31edadb08511de6095b4578746",
+    Var("chromium_url") + "/chromium/src/tools/clang.git" + "@" + "7185692a14ef62ca9686e9175549224663eaa29f",
   "v8/test/wasm-js":
     Var("chromium_url") + "/external/github.com/WebAssembly/spec.git" + "@" + "aadd3a340c78e53078a7bb6c17cc30f105c2960c",
 }

src/base.isolate

@@ -24,14 +24,6 @@
         ],
       },
     }],
-    ['OS=="linux" and (asan==1 or cfi_vptr==1 or msan==1 or tsan==1)', {
-      'variables': {
-        'files': [
-          # For llvm-symbolizer.
-          '../third_party/llvm-build/Release+Asserts/lib/libstdc++.so.6',
-        ],
-      },
-    }],
     ['asan==1 or cfi_vptr==1 or msan==1 or tsan==1', {
       'variables': {
         'files': [