Unsafe.compareAndSwapLong() intrinsic for x86.

Change-Id: Idbc5371a62dfdd84485a657d4548990519200205
diff --git a/compiler/dex/quick/x86/target_x86.cc b/compiler/dex/quick/x86/target_x86.cc
index 878fa76..b7a607f 100644
--- a/compiler/dex/quick/x86/target_x86.cc
+++ b/compiler/dex/quick/x86/target_x86.cc
@@ -165,6 +165,10 @@
   if (flags & REG_USED) {
     SetupRegMask(&lir->u.m.use_mask, rDX);
   }
+
+  if (flags & REG_USEB) {
+    SetupRegMask(&lir->u.m.use_mask, rBX);
+  }
 }
 
 /* For dumping instructions */