Add ARM mode encoding for [SU]XT[BH] and [SU]XTA[BH] instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116421 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMCodeEmitter.cpp b/lib/Target/ARM/ARMCodeEmitter.cpp
index d49a79d..b86c8c9 100644
--- a/lib/Target/ARM/ARMCodeEmitter.cpp
+++ b/lib/Target/ARM/ARMCodeEmitter.cpp
@@ -170,6 +170,8 @@
       const { return 0; }
     unsigned getSORegOpValue(const MachineInstr &MI, unsigned Op)
       const { return 0; }
+    unsigned getRotImmOpValue(const MachineInstr &MI, unsigned Op)
+      const { return 0; }
 
     /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
     /// machine operand requires relocation, record the relocation and return