Fix BUILD.gn files and add presubmit step

src/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 943 matching lines @@
         'i18n.cc',
         'i18n.h',
         'icu_util.cc',
         'icu_util.h',
         'ic/access-compiler.cc',
         'ic/access-compiler.h',
         'ic/call-optimization.cc',
         'ic/call-optimization.h',
         'ic/handler-compiler.cc',
         'ic/handler-compiler.h',
+        'ic/handler-configuration.h',
         'ic/ic-inl.h',
         'ic/ic-state.cc',
         'ic/ic-state.h',
         'ic/ic.cc',
         'ic/ic.h',
         'ic/ic-compiler.cc',
         'ic/ic-compiler.h',
         'identity-map.cc',
         'identity-map.h',
         'interface-descriptors.cc',
@@ skipping 431 matching lines @@
             'ia32/codegen-ia32.cc',
             'ia32/codegen-ia32.h',
             'ia32/cpu-ia32.cc',
             'ia32/deoptimizer-ia32.cc',
             'ia32/disasm-ia32.cc',
             'ia32/frames-ia32.cc',
             'ia32/frames-ia32.h',
             'ia32/interface-descriptors-ia32.cc',
             'ia32/macro-assembler-ia32.cc',
             'ia32/macro-assembler-ia32.h',
+            'ia32/simulator-ia32.cc',
+            'ia32/simulator-ia32.h',
             'builtins/ia32/builtins-ia32.cc',
             'compiler/ia32/code-generator-ia32.cc',
             'compiler/ia32/instruction-codes-ia32.h',
             'compiler/ia32/instruction-scheduler-ia32.cc',
             'compiler/ia32/instruction-selector-ia32.cc',
             'crankshaft/ia32/lithium-codegen-ia32.cc',
             'crankshaft/ia32/lithium-codegen-ia32.h',
             'crankshaft/ia32/lithium-gap-resolver-ia32.cc',
             'crankshaft/ia32/lithium-gap-resolver-ia32.h',
             'crankshaft/ia32/lithium-ia32.cc',
@@ skipping 19 matching lines @@
             'x87/codegen-x87.cc',
             'x87/codegen-x87.h',
             'x87/cpu-x87.cc',
             'x87/deoptimizer-x87.cc',
             'x87/disasm-x87.cc',
             'x87/frames-x87.cc',
             'x87/frames-x87.h',
             'x87/interface-descriptors-x87.cc',
             'x87/macro-assembler-x87.cc',
             'x87/macro-assembler-x87.h',
+            'x87/simulator-x87.cc',
+            'x87/simulator-x87.h',
             'builtins/x87/builtins-x87.cc',
             'compiler/x87/code-generator-x87.cc',
             'compiler/x87/instruction-codes-x87.h',
             'compiler/x87/instruction-scheduler-x87.cc',
             'compiler/x87/instruction-selector-x87.cc',
             'crankshaft/x87/lithium-codegen-x87.cc',
             'crankshaft/x87/lithium-codegen-x87.h',
             'crankshaft/x87/lithium-gap-resolver-x87.cc',
             'crankshaft/x87/lithium-gap-resolver-x87.h',
             'crankshaft/x87/lithium-x87.cc',
@@ skipping 112 matching lines @@
             'x64/codegen-x64.cc',
             'x64/codegen-x64.h',
             'x64/cpu-x64.cc',
             'x64/deoptimizer-x64.cc',
             'x64/disasm-x64.cc',
             'x64/frames-x64.cc',
             'x64/frames-x64.h',
             'x64/interface-descriptors-x64.cc',
             'x64/macro-assembler-x64.cc',
             'x64/macro-assembler-x64.h',
+            'x64/simulator-x64.cc',
+            'x64/simulator-x64.h',
             'x64/sse-instr.h',
             'debug/x64/debug-x64.cc',
             'full-codegen/x64/full-codegen-x64.cc',
             'ic/x64/access-compiler-x64.cc',
             'ic/x64/handler-compiler-x64.cc',
             'ic/x64/ic-x64.cc',
             'ic/x64/ic-compiler-x64.cc',
             'ic/x64/stub-cache-x64.cc',
             'regexp/x64/regexp-macro-assembler-x64.cc',
             'regexp/x64/regexp-macro-assembler-x64.h',
+            'third_party/valgrind/valgrind.h',
           ],
         }],
         ['v8_target_arch=="x64"', {
           'sources': [
             'compiler/x64/code-generator-x64.cc',
             'compiler/x64/instruction-codes-x64.h',
             'compiler/x64/instruction-scheduler-x64.cc',
             'compiler/x64/instruction-selector-x64.cc',
             'compiler/x64/unwinding-info-writer-x64.h',
             'compiler/x64/unwinding-info-writer-x64.cc',
@@ skipping 841 matching lines @@
       'conditions': [
         ['want_separate_host_toolset_mkpeephole==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }