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_System.cc b/src/native/java_lang_System.cc
index f4fe6ca..d74c9db 100644
--- a/src/native/java_lang_System.cc
+++ b/src/native/java_lang_System.cc
@@ -102,7 +102,7 @@
 namespace art {
 
 static void ThrowArrayStoreException_NotAnArray(const char* identifier, Object* array)
-    SHARED_LOCKS_REQUIRED(GlobalSynchronization::mutator_lock_) {
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
   std::string actualType(PrettyTypeOf(array));
   Thread::Current()->ThrowNewExceptionF("Ljava/lang/ArrayStoreException;",
       "%s of type %s is not an array", identifier, actualType.c_str());