MIPS64: Add vector registers to Mips64ManagedRegister class

Also created managed_register_mips64_test.

Test: mma test-art-host-gtest

Change-Id: I3996691c8cc8bbc73f5d7ea294a31668905f6e8a
diff --git a/compiler/Android.bp b/compiler/Android.bp
index d57f301..b444fff 100644
--- a/compiler/Android.bp
+++ b/compiler/Android.bp
@@ -391,6 +391,7 @@
         mips64: {
             srcs: [
                 "linker/mips64/relative_patcher_mips64_test.cc",
+                "utils/mips64/managed_register_mips64_test.cc",
             ],
         },
         x86: {