Use ATTRIBUTE_UNUSED more.

Use it in lieu of UNUSED(), which had some incorrect uses.

Change-Id: If247dce58b72056f6eea84968e7196f0b5bef4da
diff --git a/compiler/dex/quick/ralloc_util.cc b/compiler/dex/quick/ralloc_util.cc
index 8ec86fa..d9d0434 100644
--- a/compiler/dex/quick/ralloc_util.cc
+++ b/compiler/dex/quick/ralloc_util.cc
@@ -320,15 +320,13 @@
 }
 
 // TODO: this is Thumb2 only.  Remove when DoPromotion refactored.
-RegStorage Mir2Lir::AllocPreservedDouble(int s_reg) {
-  UNUSED(s_reg);
+RegStorage Mir2Lir::AllocPreservedDouble(int s_reg ATTRIBUTE_UNUSED) {
   UNIMPLEMENTED(FATAL) << "Unexpected use of AllocPreservedDouble";
   UNREACHABLE();
 }
 
 // TODO: this is Thumb2 only.  Remove when DoPromotion refactored.
-RegStorage Mir2Lir::AllocPreservedSingle(int s_reg) {
-  UNUSED(s_reg);
+RegStorage Mir2Lir::AllocPreservedSingle(int s_reg ATTRIBUTE_UNUSED) {
   UNIMPLEMENTED(FATAL) << "Unexpected use of AllocPreservedSingle";
   UNREACHABLE();
 }
@@ -1553,8 +1551,7 @@
   return (lowSreg == INVALID_SREG) ? INVALID_SREG : lowSreg + 1;
 }
 
-bool Mir2Lir::LiveOut(int s_reg) {
-  UNUSED(s_reg);
+bool Mir2Lir::LiveOut(int s_reg ATTRIBUTE_UNUSED) {
   // For now.
   return true;
 }