Move atomic ops and related files to base library

src/base/atomicops_internals_mips_gcc.h

Index: src/base/atomicops_internals_mips_gcc.h
diff --git a/src/atomicops_internals_mips_gcc.h b/src/base/atomicops_internals_mips_gcc.h
similarity index 96%
rename from src/atomicops_internals_mips_gcc.h
rename to src/base/atomicops_internals_mips_gcc.h
index da9f6e99364c65de7a3becc1b3540f79c57e7766..0d3a0e38c138d93bac2669d8acbb8e6764c22bba 100644
--- a/src/atomicops_internals_mips_gcc.h
+++ b/src/base/atomicops_internals_mips_gcc.h
@@ -4,11 +4,11 @@
 
 // This file is an internal atomic implementation, use atomicops.h instead.
 
-#ifndef V8_ATOMICOPS_INTERNALS_MIPS_GCC_H_
-#define V8_ATOMICOPS_INTERNALS_MIPS_GCC_H_
+#ifndef V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_
+#define V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_
 
 namespace v8 {
-namespace internal {
+namespace base {
 
 // Atomically execute:
 //      result = *ptr;
@@ -154,6 +154,6 @@ inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
   return *ptr;
 }
 
-} }  // namespace v8::internal
+} }  // namespace v8::base
 
-#endif  // V8_ATOMICOPS_INTERNALS_MIPS_GCC_H_
+#endif  // V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_