Move atomic ops and related files to base library

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 9588ab8c427fe1825e52a51a2c93e32421545d52..570a1a7ea4e2178bc67ab8b9d5777fa7a4f6ee36 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -367,8 +367,6 @@ source_set("v8_base") {
     "src/assert-scope.cc",
     "src/ast.cc",
     "src/ast.h",
-    "src/atomicops.h",
-    "src/atomicops_internals_x86_gcc.cc",
     "src/bignum-dtoa.cc",
     "src/bignum-dtoa.h",
     "src/bignum.cc",
@@ -550,7 +548,6 @@ source_set("v8_base") {
     "src/jsregexp-inl.h",
     "src/jsregexp.cc",
     "src/jsregexp.h",
-    "src/lazy-instance.h",
     # TODO(jochen): move libplatform/ files to their own target.
     "src/libplatform/default-platform.cc",
     "src/libplatform/default-platform.h",
@@ -588,8 +585,6 @@ source_set("v8_base") {
     "src/objects-visiting.h",
     "src/objects.cc",
     "src/objects.h",
-    "src/once.cc",
-    "src/once.h",
     "src/optimizing-compiler-thread.h",
     "src/optimizing-compiler-thread.cc",
     "src/parser.cc",
@@ -959,8 +954,22 @@ source_set("v8_libbase") {
   visibility = ":*"  # Only targets in this file can depend on this.
 
   sources = [
+    "src/base/atomicops.h",
+    "src/base/atomicops_internals_arm64_gcc.h",
+    "src/base/atomicops_internals_arm_gcc.h",
+    "src/base/atomicops_internals_atomicword_compat.h",
+    "src/base/atomicops_internals_mac.h",
+    "src/base/atomicops_internals_mips_gcc.h",
+    "src/base/atomicops_internals_tsan.h",
+    "src/base/atomicops_internals_x86_gcc.cc",
+    "src/base/atomicops_internals_x86_gcc.h",
+    "src/base/atomicops_internals_x86_msvc.h",
     "src/base/build_config.h",
+    "src/base/lazy-instance.h",
     "src/base/macros.h",
+    "src/base/once.cc",
+    "src/base/once.h",
+    "src/base/win32-headers.h",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]