GN: Don't pass -integrated-as to pnacl-clang

build/config/nacl/BUILD.gn

 # Copyright (c) 2014 The Native Client 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/nacl/config.gni")
 
 # Native Client Definitions
 config("nacl_defines") {
   defines = [
     "_DEFAULT_SOURCE=1",
@@ skipping 21 matching lines @@
   public_configs = [ ":nacl_defines" ]
   if (current_os == "nacl") {
     public_configs += [ ":nexe_defines" ]
   }
 }
 
 config("compiler") {
   configs = []
   cflags = []
 
-  if (is_clang) {
+  if (is_clang && current_cpu != "pnacl") {
     # -no-integrated-as is the default in nacl-clang for historical
     # compatibility with inline assembly code and so forth.  But there
     # are no such cases in Chromium code, and -integrated-as is nicer in
     # general.  Moreover, the IRT must be built using LLVM's assembler
     # on x86-64 to preserve sandbox base address hiding.  Use it
     # everywhere for consistency (and possibly quicker builds).
     cflags += [ "-integrated-as" ]
   }
 
   asmflags = cflags
@@ skipping 33 matching lines @@
     "-Os",
 
     # These are omitted from non-IRT libraries to keep the libraries
     # themselves small.
     "-ffunction-sections",
     "-fdata-sections",
   ]
 
   ldflags = [ "-Wl,--gc-sections" ]
 }