Reland "Update clang and gn to match Fuchsia."

This reverts commit a99b0f6c09.

To fix culprit for the revert, it no longer rolls zlib, instead adds
an option to ignore clang warnings in zlib source code.

TEST=ci

Change-Id: I9a877ff0c08af961bc49fcacaad5b01f1ed0a743
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249542
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>

DEPS

@@ -66,8 +66,8 @@ vars = {
   # The list of revisions for these tools comes from Fuchsia, here:
   # https://fuchsia.googlesource.com/integration/+/HEAD/toolchain
   # If there are problems with the toolchain, contact fuchsia-toolchain@.
-  "clang_revision": "c2592c374e469f343ecea82d6728609650924259",
-  "gn_revision": "d7c2209cebcfe37f46dba7be4e1a7000ffc342fb",
+  "clang_revision": "aaaf8e4c409f080f35ea227b20dc6ac8a45c2fa4",
+  "gn_revision": "e62d4e1938a45babc9afb6db543f388cd1802a52",
 
   # Scripts that make 'git cl format' work.
   "clang_format_scripts_rev": "bb994c6f067340c1135eb43eed84f4b33cfa7397",

build/config/compiler/BUILD.gn

@@ -545,6 +545,7 @@ if (is_win) {
       "-Wno-microsoft-unqualified-friend",
       "-Wno-unknown-argument",  # icu
       "-Wno-unused-value",  # crashpad
+      "-Wno-deprecated-non-prototype",  # zlib
     ]
   } else {
     default_warning_flags += [
@@ -576,6 +577,7 @@ if (is_win) {
     default_warning_flags += [
       "-Wno-tautological-constant-compare",
       "-Wno-unused-but-set-variable",  # icu
+      "-Wno-deprecated-non-prototype",  # zlib
     ]
   } else {
     default_warning_flags +=

runtime/vm/malloc_hooks_ia32.cc

@@ -11,9 +11,9 @@
 namespace dart {
 
 #if defined(DEBUG)
-const intptr_t kSkipCount = 6;
+const intptr_t kSkipCount = 7;
 #elif !(defined(PRODUCT) || defined(DEBUG))
-const intptr_t kSkipCount = 5;
+const intptr_t kSkipCount = 6;
 #endif
 
 }  // namespace dart