Fix BUILD.gn files and add presubmit step

test/unittests/BUILD.gn

Index: test/unittests/BUILD.gn
diff --git a/test/unittests/BUILD.gn b/test/unittests/BUILD.gn
index 4210d6eb348937c1a0476b441a94542858c2b35e..9dddb100edc8839701c6d0be1df7c97e4ce7ee1f 100644
--- a/test/unittests/BUILD.gn
+++ b/test/unittests/BUILD.gn
@@ -54,6 +54,7 @@ v8_executable("unittests") {
     "compiler/js-operator-unittest.cc",
     "compiler/js-typed-lowering-unittest.cc",
     "compiler/linkage-tail-call-unittest.cc",
+    "compiler/live-range-builder.h",
     "compiler/live-range-unittest.cc",
     "compiler/liveness-analyzer-unittest.cc",
     "compiler/load-elimination-unittest.cc",
@@ -100,6 +101,7 @@ v8_executable("unittests") {
     "interpreter/bytecode-pipeline-unittest.cc",
     "interpreter/bytecode-register-allocator-unittest.cc",
     "interpreter/bytecode-register-optimizer-unittest.cc",
+    "interpreter/bytecode-utils.h",
     "interpreter/bytecodes-unittest.cc",
     "interpreter/constant-array-builder-unittest.cc",
     "interpreter/interpreter-assembler-unittest.cc",