ART: Do not emit load when inlining unused Thread.currentThread()

When the result is not used, do not emit the load. This avoids
uninitialized registers leading to size-check errors.

Change-Id: I212392ffea7243720f120b2f12679df286106a02
diff --git a/test/082-inline-execute/src/Main.java b/test/082-inline-execute/src/Main.java
index 5b8134d..3b11879 100644
--- a/test/082-inline-execute/src/Main.java
+++ b/test/082-inline-execute/src/Main.java
@@ -49,6 +49,7 @@
     test_String_indexOf();
     test_String_isEmpty();
     test_String_length();
+    test_Thread_currentThread();
   }
 
   /*
@@ -70,6 +71,17 @@
       return (b - a) < maxDelta;
   }
 
+  /**
+   * Will test inlining Thread.currentThread().
+   */
+  public static void test_Thread_currentThread() {
+    // 1. Do not use result.
+    Thread.currentThread();
+
+    // 2. Result should not be null.
+    Assert.assertNotNull(Thread.currentThread());
+  }
+
   public static void test_String_length() {
     String str0 = "";
     String str1 = "x";