Enable FCVTMU Xd,Sn.  Fixes #343332.


git-svn-id: svn://svn.valgrind.org/vex/trunk@3085 8f6e269a-dfd6-0310-a8e1-e2731360e62c
diff --git a/priv/guest_arm64_toIR.c b/priv/guest_arm64_toIR.c
index f5a903a..8cefe7e 100644
--- a/priv/guest_arm64_toIR.c
+++ b/priv/guest_arm64_toIR.c
@@ -12558,6 +12558,7 @@
           || (iop == Iop_F32toI64S && irrm == Irrm_NEAREST)/* FCVT{A,N}S X,S */
           /* F32toI64U */
           || (iop == Iop_F32toI64U && irrm == Irrm_ZERO)   /* FCVTZU Xd,Sn */
+          || (iop == Iop_F32toI64U && irrm == Irrm_NegINF) /* FCVTMU Xd,Sn */
           || (iop == Iop_F32toI64U && irrm == Irrm_PosINF) /* FCVTPU Xd,Sn */
           /* F64toI32S */
           || (iop == Iop_F64toI32S && irrm == Irrm_ZERO)   /* FCVTZS Wd,Dn */