Revert "Roll clang n332890-c2443155-1 : n333938-3a6da112-1."

This reverts commit 0d406dbc.

Reason for revert:
- Fuchsia arm64 bug (crbug.com/1037700)
- Android arm64 bug (crbug.com/1037912)
- 10% perf regression (crbug.com/1036818)

Original change's description:
> Reland "Roll clang n332890-c2443155-1 : n333938-3a6da112-1."
>
> This is a reland of b21c79dc
>
> Original change's description:
> > Roll clang n332890-c2443155-1 : n333938-3a6da112-1.
> >
> > Ran `./tools/clang/scripts/upload_revision.py 3a6da1122b990386edeba0987d0d1fdc9c8dc53d`.
> >
> > Bug: 1030664
> > Change-Id: I229bf8fd0d65fcacdab5f002220d1350b38aedb6
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1966387
> > Auto-Submit: Reid Kleckner <rnk@chromium.org>
> > Commit-Queue: Nico Weber <thakis@chromium.org>
> > Reviewed-by: Nico Weber <thakis@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#727069}
>
> Bug: 1030664
> Change-Id: I7a7fdcf7b0c6bd22f4840748318f7180931ea468
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1979068
> Reviewed-by: Hans Wennborg <hans@chromium.org>
> Commit-Queue: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#727096}

TBR=thakis@chromium.org,ukai@chromium.org,hans@chromium.org,rnk@chromium.org

Bug: 1030664, 1037700, 1037912, 1036818
Change-Id: If73d19f7f5a0febdd83087b0a6f257f8ad21a36f
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1982227
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Reviewed-by: Reid Kleckner <rnk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727515}

build/config/compiler/BUILD.gn

@@ -632,15 +632,6 @@ config("compiler") {
             "-Wl,--thinlto-cache-policy,$cache_policy",
           ]
         }
-
-        # Disable TypePromotion to work around compiler crash in Android LTO builds.
-        # TODO(crbug.com/1033863): Fixed upstream; remove in next clang roll.
-        if (!llvm_force_head_revision && target_os != "chromeos") {
-          ldflags += [
-            "-Wl,-mllvm",
-            "-Wl,-disable-type-promotion=true",
-          ]
-        }
       } else {
         ldflags += [ "-Wl,-plugin-opt,jobs=" + max_jobs_per_link ]
       }
@@ -1537,9 +1528,6 @@ config("default_warnings") {
 
           # TODO(https://crbug.com/1028110): Evaluate and possible enable.
           "-Wno-deprecated-copy",
-
-          # TODO(https://crbug.com/1031169): Clean up and enable.
-          "-Wno-misleading-indentation",
         ]
 
         if (is_win) {
@@ -1553,6 +1541,13 @@ config("default_warnings") {
           # TODO(https://crbug.com/995993): Clean up and enable.
           "-Wno-implicit-fallthrough",
         ]
+
+        if (llvm_force_head_revision) {
+          cflags += [
+            # TODO(https://crbug.com/1031169): Clean up and enable.
+            "-Wno-misleading-indentation",
+          ]
+        }
       }
     }
   }

tools/clang/scripts/update.py

@@ -39,8 +39,8 @@ 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 = '3a6da1122b990386edeba0987d0d1fdc9c8dc53d'
-CLANG_SVN_REVISION = 'n333938'
+CLANG_REVISION = 'c2443155a0fb245c8f17f2c1c72b6ea391e86e81'
+CLANG_SVN_REVISION = 'n332890'
 CLANG_SUB_REVISION = 1
 
 PACKAGE_VERSION = '%s-%s-%s' % (CLANG_SVN_REVISION, CLANG_REVISION[:8],