Rename GlobalSynchronization to Locks

Also address some review comments in common_throws relating to
ToStr<InvokeType> and exception detail messages.

Change-Id: Ibf2c0f147689fa236d349bd7f01eed3c2522552b
diff --git a/src/native/java_lang_Thread.cc b/src/native/java_lang_Thread.cc
index a0c90ee..adc246a 100644
--- a/src/native/java_lang_Thread.cc
+++ b/src/native/java_lang_Thread.cc
@@ -35,7 +35,7 @@
 
 static jboolean Thread_isInterrupted(JNIEnv* env, jobject java_thread) {
   ScopedObjectAccess soa(env);
-  MutexLock mu(*GlobalSynchronization::thread_list_lock_);
+  MutexLock mu(*Locks::thread_list_lock_);
   Thread* thread = Thread::FromManagedThread(soa, java_thread);
   return (thread != NULL) ? thread->IsInterrupted() : JNI_FALSE;
 }
@@ -56,10 +56,10 @@
 
   ScopedObjectAccess soa(env);
   ThreadState internal_thread_state = (has_been_started ? kTerminated : kStarting);
-  MutexLock mu(*GlobalSynchronization::thread_list_lock_);
+  MutexLock mu(*Locks::thread_list_lock_);
   Thread* thread = Thread::FromManagedThread(soa, java_thread);
   if (thread != NULL) {
-    MutexLock mu(*GlobalSynchronization::thread_suspend_count_lock_);
+    MutexLock mu(*Locks::thread_suspend_count_lock_);
     internal_thread_state = thread->GetState();
   }
   switch (internal_thread_state) {
@@ -92,14 +92,14 @@
     Thread::Current()->ThrowNewException("Ljava/lang/NullPointerException;", "object == null");
     return JNI_FALSE;
   }
-  MutexLock mu(*GlobalSynchronization::thread_list_lock_);
+  MutexLock mu(*Locks::thread_list_lock_);
   Thread* thread = Thread::FromManagedThread(soa, java_thread);
   return thread->HoldsLock(object);
 }
 
 static void Thread_nativeInterrupt(JNIEnv* env, jobject java_thread) {
   ScopedObjectAccess soa(env);
-  MutexLock mu(*GlobalSynchronization::thread_list_lock_);
+  MutexLock mu(*Locks::thread_list_lock_);
   Thread* thread = Thread::FromManagedThread(soa, java_thread);
   if (thread != NULL) {
     thread->Interrupt();
@@ -140,7 +140,7 @@
  */
 static void Thread_nativeSetPriority(JNIEnv* env, jobject java_thread, jint new_priority) {
   ScopedObjectAccess soa(env);
-  MutexLock mu(*GlobalSynchronization::thread_list_lock_);
+  MutexLock mu(*Locks::thread_list_lock_);
   Thread* thread = Thread::FromManagedThread(soa, java_thread);
   if (thread != NULL) {
     thread->SetNativePriority(new_priority);