[gn] Fix targets for x86 v8_target_arch

test/cctest/BUILD.gn

 # Copyright 2016 The V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Please keep this file in sync with cctest.gyp.
 
 import("../../gni/v8.gni")
 
 v8_executable("cctest") {
   testonly = true
@@ skipping 176 matching lines @@
       "test-assembler-arm64.cc",
       "test-code-stubs-arm64.cc",
       "test-code-stubs.cc",
       "test-disasm-arm64.cc",
       "test-fuzz-arm64.cc",
       "test-javascript-arm64.cc",
       "test-js-arm64-variables.cc",
       "test-run-wasm-relocation-arm64.cc",
       "test-utils-arm64.cc",
     ]
-  } else if (v8_target_arch == "ia32") {
+  } else if (v8_target_arch == "x86") {
     sources += [
       "test-assembler-ia32.cc",
       "test-code-stubs-ia32.cc",
       "test-code-stubs.cc",
       "test-disasm-ia32.cc",
       "test-log-stack-tracer.cc",
       "test-macro-assembler-ia32.cc",
       "test-run-wasm-relocation-ia32.cc",
     ]
   } else if (v8_target_arch == "mips") {
@@ skipping 153 matching lines @@
     "$target_gen_dir/resources.cc",
   ]
 
   args = [
     rebase_path("$target_gen_dir/resources.cc", root_build_dir),
     "TEST",
   ]
   args += rebase_path(sources, root_build_dir)
 }
 # TODO(machenbach): Migrate generate-bytecode-expectations.