Move Partition Allocator into Chromium base.

base/sys_byteorder.h

Index: base/sys_byteorder.h
diff --git a/base/sys_byteorder.h b/base/sys_byteorder.h
index 8d9066c70228bfd7c36ec0cb3a2afe30dc006a2d..d35cbd7fd01332d371deb2009d4ae18a56de28a5 100644
--- a/base/sys_byteorder.h
+++ b/base/sys_byteorder.h
@@ -46,6 +46,16 @@ inline uint64_t ByteSwap(uint64_t x) {
 #endif
 }
 
+inline uintptr_t ByteSwapUintPtrT(uintptr_t x) {
+#if defined(ARCH_CPU_64_BITS)
+  return ByteSwap(static_cast<uint64_t>(x));

[danakj, 2016/12/09 04:52:05]

can you throw some static_asserts comparing sizeof() in that prove what you're
#if'ing on is right?

+#elif defined(ARCH_CPU_32_BITS)
+  return ByteSwap(static_cast<uint32_t>(x));
+#else
+#error architecture not supported
+#endif
+}
+
 // Converts the bytes in |x| from host order (endianness) to little endian, and
 // returns the result.
 inline uint16_t ByteSwapToLE16(uint16_t x) {