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/test/MC/ARM/simple-encoding.ll b/test/MC/ARM/simple-encoding.ll
index 01e9c98..05ecb96 100644
--- a/test/MC/ARM/simple-encoding.ll
+++ b/test/MC/ARM/simple-encoding.ll
@@ -64,4 +64,14 @@
   %add = add nsw i64 %b, %a
   ret i64 %add
 }
+
+define i32 @f7(i32 %a, i32 %b) nounwind readnone optsize ssp {
+entry:
+; CHECK: f7
+; CHECK: uxtab  r0, r0, r1            @ encoding: [0x71,0x00,0xe0,0xe6]
+  %and = and i32 %b, 255
+  %add = add i32 %and, %a
+  ret i32 %add
+}
+
 declare void @llvm.trap() nounwind