MIPS: remove immediate constraint within CompareAndSwap.

src/base/atomicops_internals_mips64_gcc.h

Index: src/base/atomicops_internals_mips64_gcc.h
diff --git a/src/base/atomicops_internals_mips64_gcc.h b/src/base/atomicops_internals_mips64_gcc.h
index 1f629b6ea17a0db31fb5874ceb4c575b47937cea..ccb973c0391ebc1436365df50c6d8defa2262376 100644
--- a/src/base/atomicops_internals_mips64_gcc.h
+++ b/src/base/atomicops_internals_mips64_gcc.h
@@ -59,7 +59,7 @@ inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
                        "2:\n"
                        ".set pop\n"
                        : "=&r" (prev), "=m" (*ptr), "=&r" (tmp)
-                       : "Ir" (old_value), "r" (new_value), "m" (*ptr)
+                       : "r" (old_value), "r" (new_value), "m" (*ptr)
                        : "memory");
   return prev;
 }
@@ -196,7 +196,7 @@ inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
                        "2:\n"
                        ".set pop\n"
                        : "=&r" (prev), "=m" (*ptr), "=&r" (tmp)
-                       : "Ir" (old_value), "r" (new_value), "m" (*ptr)
+                       : "r" (old_value), "r" (new_value), "m" (*ptr)
                        : "memory");
   return prev;
 }