Reland of land "Turn libbase into a component"

src/base/functional.h

Index: src/base/functional.h
diff --git a/src/base/functional.h b/src/base/functional.h
index ff0d8075b943079de99555dc9ec733ca5ba0337b..634e7bac85afe677d00d7eaa30bdde2c6cb87f00 100644
--- a/src/base/functional.h
+++ b/src/base/functional.h
@@ -13,6 +13,7 @@
 #include <functional>
 #include <utility>
 
+#include "src/base/base-export.h"
 #include "src/base/macros.h"
 
 namespace v8 {
@@ -67,7 +68,7 @@
 
 V8_INLINE size_t hash_combine() { return 0u; }
 V8_INLINE size_t hash_combine(size_t seed) { return seed; }
-size_t hash_combine(size_t seed, size_t value);
+V8_BASE_EXPORT size_t hash_combine(size_t seed, size_t value);
 template <typename T, typename... Ts>
 V8_INLINE size_t hash_combine(T const& v, Ts const&... vs) {
   return hash_combine(hash_combine(vs...), hash<T>()(v));
@@ -91,9 +92,9 @@
 V8_BASE_HASH_VALUE_TRIVIAL(unsigned short)  // NOLINT(runtime/int)
 #undef V8_BASE_HASH_VALUE_TRIVIAL
 
-size_t hash_value(unsigned int);
-size_t hash_value(unsigned long);       // NOLINT(runtime/int)
-size_t hash_value(unsigned long long);  // NOLINT(runtime/int)
+V8_BASE_EXPORT size_t hash_value(unsigned int);
+V8_BASE_EXPORT size_t hash_value(unsigned long);       // NOLINT(runtime/int)
+V8_BASE_EXPORT size_t hash_value(unsigned long long);  // NOLINT(runtime/int)
 
 #define V8_BASE_HASH_VALUE_SIGNED(type)            \
   V8_INLINE size_t hash_value(signed type v) {     \