GN: Fix cross ARM64 and cross MIPS builds.

build/config/compiler/BUILD.gn

 # Copyright (c) 2013 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/android/config.gni")
 if (current_cpu == "arm") {
   import("//build/config/arm.gni")
 }
 if (current_cpu == "mipsel" || current_cpu == "mips64el") {
   import("//build/config/mips.gni")
@@ skipping 208 matching lines @@
           # compiler (r5-r7). This can be verified using
           # webkit_unit_tests' WTF.Checked_int8_t test.
           "-fno-tree-sra",
 
           # The following option is disabled to improve binary
           # size and performance in gcc 4.9.
           "-fno-caller-saves",
         ]
       }
     } else if (current_cpu == "mipsel") {
+      # Some toolchains default to big-endian.
+      cflags += [ "-EL" ]
+      ldflags += [ "-EL" ]
+
       # We have to explicitly request exceptions to get good heap profiles from
       # tcmalloc.
       if (is_debug || is_release) {
         cflags += [
           "-fexceptions",
           "-funwind-tables",
         ]
       }
 
       if (mips_arch_variant == "r6") {
@@ skipping 524 matching lines @@
       cflags = [ "/Zi" ]  # Produce PDB file, no edit and continue.
     }
     ldflags = [ "/DEBUG" ]
   } else {
     cflags = [
       "-g3",
       "-ggdb3",
     ]
   }
 }