Roll clang 328716:329921.

Bug: 828582
Change-Id: I85864722c577268d9c95a0d9c37cf7197b04e5d3
Reviewed-on: https://chromium-review.googlesource.com/1012028Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550608}

build/config/compiler/BUILD.gn

@@ -464,15 +464,21 @@ config("compiler") {
     cflags += [ "-fcolor-diagnostics" ]
   }
 
-  # TODO(hans): Remove this once Clang generates better optimized debug info by
-  # default. https://crbug.com/765793
   if (is_clang && !is_nacl && current_toolchain == host_toolchain &&
       target_os != "chromeos") {
     cflags += [
+      # TODO(hans): Remove this once Clang generates better optimized debug info
+      # by default. https://crbug.com/765793
       "-Xclang",
       "-mllvm",
       "-Xclang",
       "-instcombine-lower-dbg-declare=0",
+
+      # TODO(rnk): Remove this once it's the default. https://crbug.com/793819
+      "-Xclang",
+      "-mllvm",
+      "-Xclang",
+      "-fast-isel-sink-local-values=1",
     ]
   }
 
@@ -1391,13 +1397,10 @@ config("default_warnings") {
         # Ignore warnings about MSVC optimization pragmas.
         # TODO(thakis): Only for no_chromium_code? http://crbug.com/505314
         "-Wno-ignored-pragma-optimize",
+
+        # TODO(thakis): Enable, https://crbug.com/832211
+        "-Wno-return-std-move",
       ]
-      if (llvm_force_head_revision) {
-        cflags += [
-          # TODO(thakis): Enable, https://crbug.com/832211
-          "-Wno-return-std-move",
-        ]
-      }
     } else if (use_xcode_clang) {
       cflags += [
         # TODO(thakis): https://crbug.com/604888

tools/clang/scripts/update.py

@@ -27,7 +27,7 @@ import zipfile
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://chromium.googlesource.com/chromium/src/+/master/docs/updating_clang.md
 # Reverting problematic clang rolls is safe, though.
-CLANG_REVISION = '328716'
+CLANG_REVISION = '329921'
 
 use_head_revision = bool(os.environ.get('LLVM_FORCE_HEAD_REVISION', '0')
                          in ('1', 'YES'))
@@ -35,7 +35,7 @@ if use_head_revision:
   CLANG_REVISION = 'HEAD'
 
 # This is incremented when pushing a new build of Clang at the same revision.
-CLANG_SUB_REVISION=2
+CLANG_SUB_REVISION=1
 
 PACKAGE_VERSION = "%s-%s" % (CLANG_REVISION, CLANG_SUB_REVISION)