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/oat_test.cc b/src/oat_test.cc
index 288854b..0886864 100644
--- a/src/oat_test.cc
+++ b/src/oat_test.cc
@@ -26,7 +26,7 @@
   void CheckMethod(Method* method,
                    const OatFile::OatMethod& oat_method,
                    const DexFile* dex_file)
-      SHARED_LOCKS_REQUIRED(GlobalSynchronization::mutator_lock_) {
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     const CompiledMethod* compiled_method =
         compiler_->GetCompiledMethod(Compiler::MethodReference(dex_file,
                                                                method->GetDexMethodIndex()));