Build 64bit browser for Android with clang for ARMv8

third_party/libwebp/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/arm.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 config("libwebp_config") {
   include_dirs = [ "." ]
 }
@@ skipping 177 matching lines @@
 
     if (set_opt_level) {
       configs -= [ "//build/config/compiler:default_optimization" ]
       configs += [ "//build/config/compiler:optimize_max" ]
     }
 
     if (current_cpu == "arm") {
       # behavior similar to *.c.neon in an Android.mk
       configs -= [ "//build/config/compiler:compiler_arm_fpu" ]
       cflags = [ "-mfpu=neon" ]
-    } else if (current_cpu == "arm64") {
+    } else if (current_cpu == "arm64" && !is_clang) {
       # avoid an ICE with gcc-4.9: b/15574841
       cflags = [ "-frename-registers" ]
     }
 
     if (is_android) {
       configs -= [ "//build/config/android:default_cygprofile_instrumentation" ]
       configs += [ "//build/config/android:no_cygprofile_instrumentation" ]
     }
   }
 }  # use_dsp_neon
@@ skipping 77 matching lines @@
     ":libwebp_demux",
     ":libwebp_dsp",
     ":libwebp_enc",
     ":libwebp_utils",
   ]
   public_configs = [ ":libwebp_config" ]
   if (use_dsp_neon) {
     deps += [ ":libwebp_dsp_neon" ]
   }
 }