Enable -Wbitwise-conditional-parentheses

...except on Android, where this fires once in libunwind's
arm32 code, which we'll have to fix first.

Bug: 1016947
Change-Id: I5f64a1805736a30f1cf4050e9ec0ceb4ff4eae2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032791
Commit-Queue: Hans Wennborg <hans@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737741}

build/config/compiler/BUILD.gn

@@ -1521,9 +1521,6 @@ config("default_warnings") {
           # TODO(https://crbug.com/999886): Clean up, enable.
           "-Wno-final-dtor-non-final-class",
 
-          # TODO(https://crbug.com/1016947) Clean up, enable.
-          "-Wno-bitwise-conditional-parentheses",
-
           # TODO(https://crbug.com/1016945) Clean up, enable.
           "-Wno-builtin-assume-aligned-alignment",
 
@@ -1537,6 +1534,13 @@ config("default_warnings") {
           "-Wno-range-loop-analysis",
         ]
 
+        if (is_android) {
+          cflags += [
+            # TODO(https://crbug.com/1016947) Clean up, enable.
+            "-Wno-bitwise-conditional-parentheses",
+          ]
+        }
+
         cflags_c += [
           # TODO(https://crbug.com/995993): Clean up and enable.
           "-Wno-implicit-fallthrough",