Adds ABSL_CONST_INIT to initializing declarations where it is missing

Fixes #1159

PiperOrigin-RevId: 444278141
Change-Id: Iae055fe78b438c31150a9e7601b734f4981f002e

absl/base/internal/thread_identity.cc

@@ -56,6 +56,7 @@ void AllocateThreadIdentityKey(ThreadIdentityReclaimerFunction reclaimer) {
 // *different* instances of this ptr.
 // Apple platforms have the visibility attribute, but issue a compile warning
 // that protected visibility is unsupported.
+ABSL_CONST_INIT  // Must come before __attribute__((visibility("protected")))
 #if ABSL_HAVE_ATTRIBUTE(visibility) && !defined(__APPLE__)
 __attribute__((visibility("protected")))
 #endif  // ABSL_HAVE_ATTRIBUTE(visibility) && !defined(__APPLE__)

absl/base/log_severity.cc

@@ -16,6 +16,8 @@
 
 #include <ostream>
 
+#include "absl/base/attributes.h"
+
 namespace absl {
 ABSL_NAMESPACE_BEGIN