ART: Add Clang's -Wused-but-marked-unused

Add detection of wrong unused annotations. Fix our codebase.

Change-Id: I85cc20f2eac71c1ec6c5c7cd6efb08454a629634
diff --git a/compiler/dex/local_value_numbering.cc b/compiler/dex/local_value_numbering.cc
index dc222b5..cdf5e38 100644
--- a/compiler/dex/local_value_numbering.cc
+++ b/compiler/dex/local_value_numbering.cc
@@ -166,9 +166,9 @@
     return gvn->LookupValue(kAliasingArrayOp, type, location, memory_version);
   }
 
-  static uint16_t LookupMergeValue(GlobalValueNumbering* gvn ATTRIBUTE_UNUSED,
+  static uint16_t LookupMergeValue(GlobalValueNumbering* gvn,
                                    const LocalValueNumbering* lvn,
-                                   uint16_t type ATTRIBUTE_UNUSED, uint16_t location) {
+                                   uint16_t type, uint16_t location) {
     // If the location is non-aliasing in lvn, use the non-aliasing value.
     uint16_t array = gvn->GetArrayLocationBase(location);
     if (lvn->IsNonAliasingArray(array, type)) {
@@ -182,8 +182,6 @@
   static bool HasNewBaseVersion(GlobalValueNumbering* gvn ATTRIBUTE_UNUSED,
                                 const LocalValueNumbering* lvn,
                                 uint16_t type ATTRIBUTE_UNUSED) {
-    UNUSED(gvn);
-    UNUSED(type);
     return lvn->global_memory_version_ == lvn->merge_new_memory_version_;
   }
 
diff --git a/compiler/optimizing/intrinsics_arm.cc b/compiler/optimizing/intrinsics_arm.cc
index 33176f0..94e27e9 100644
--- a/compiler/optimizing/intrinsics_arm.cc
+++ b/compiler/optimizing/intrinsics_arm.cc
@@ -776,10 +776,10 @@
   __ mov(out, ShifterOperand(0), CC);
 }
 
-void IntrinsicLocationsBuilderARM::VisitUnsafeCASInt(HInvoke* invoke ATTRIBUTE_UNUSED) {
+void IntrinsicLocationsBuilderARM::VisitUnsafeCASInt(HInvoke* invoke) {
   CreateIntIntIntIntIntToIntPlusTemps(arena_, invoke);
 }
-void IntrinsicLocationsBuilderARM::VisitUnsafeCASObject(HInvoke* invoke ATTRIBUTE_UNUSED) {
+void IntrinsicLocationsBuilderARM::VisitUnsafeCASObject(HInvoke* invoke) {
   CreateIntIntIntIntIntToIntPlusTemps(arena_, invoke);
 }
 void IntrinsicCodeGeneratorARM::VisitUnsafeCASInt(HInvoke* invoke) {
diff --git a/compiler/utils/arm/assembler_thumb2.cc b/compiler/utils/arm/assembler_thumb2.cc
index a894319..3e8d9c3 100644
--- a/compiler/utils/arm/assembler_thumb2.cc
+++ b/compiler/utils/arm/assembler_thumb2.cc
@@ -683,7 +683,7 @@
 
 bool Thumb2Assembler::Is32BitDataProcessing(Condition cond ATTRIBUTE_UNUSED,
                                             Opcode opcode,
-                                            bool set_cc ATTRIBUTE_UNUSED,
+                                            bool set_cc,
                                             Register rn,
                                             Register rd,
                                             const ShifterOperand& so) {