Implement thin-lock fast path for compiler-llvm.

Change-Id: I09d6a0dba4df7cbeb0c0e3f432ab3b09fce0846d
diff --git a/src/compiler_llvm/method_compiler.cc b/src/compiler_llvm/method_compiler.cc
index eecace0..4021f7b 100644
--- a/src/compiler_llvm/method_compiler.cc
+++ b/src/compiler_llvm/method_compiler.cc
@@ -1551,9 +1551,7 @@
     EmitGuard_NullPointerException(dex_pc, object_addr);
   }
 
-  llvm::Value* thread_object_addr = irb_.Runtime().EmitGetCurrentThread();
-
-  irb_.CreateCall2(irb_.GetRuntime(LockObject), object_addr, thread_object_addr);
+  irb_.Runtime().EmitLockObject(object_addr);
 
   irb_.CreateBr(GetNextBasicBlock(dex_pc));
 }
@@ -1573,9 +1571,7 @@
 
   EmitUpdateDexPC(dex_pc);
 
-  llvm::Value* thread_object_addr = irb_.Runtime().EmitGetCurrentThread();
-
-  irb_.CreateCall2(irb_.GetRuntime(UnlockObject), object_addr, thread_object_addr);
+  irb_.Runtime().EmitUnlockObject(object_addr);
 
   EmitGuard_ExceptionLandingPad(dex_pc, true);