Apply -fno-tree-sra and -fno-caller-saves only to Android

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")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/nacl/config.gni")
 import("//build/toolchain/cc_wrapper.gni")
 
@@ skipping 576 matching lines @@
   } else if (is_posix && !is_mac && !is_ios) {
     if (current_cpu == "x86") {
       if (is_clang) {
         cflags += [
           # Else building libyuv gives clang's register allocator issues,
           # see llvm.org/PR15798 / crbug.com/233709
           "-momit-leaf-frame-pointer",
         ]
       }
     } else if (current_cpu == "arm") {
-      if (!is_clang) {
+      if (is_android && !is_clang) {
         # Clang doesn't support these flags.
         cflags += [
           # The tree-sra optimization (scalar replacement for
           # aggregates enabling subsequent optimizations) leads to
           # invalid code generation when using the Android NDK's
           # 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
@@ skipping 730 matching lines @@
 
 if (is_ios || is_mac) {
   # On Mac and iOS, this enables support for ARC (automatic ref-counting).
   # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
   config("enable_arc") {
     common_flags = [ "-fobjc-arc" ]
     cflags_objc = common_flags
     cflags_objcc = common_flags
   }
 }