Implement the immediate part of the 'B' modifier.

Part of rdar://9119939


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132023 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index ac61c03..f1edc55 100644
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -417,6 +417,10 @@
       }
       // Fallthrough to unsupported.
     case 'B': // Bitwise inverse of integer or symbol without a preceding #.
+      if (!MI->getOperand(OpNum).isImm())
+        return true;
+      O << ~(MI->getOperand(OpNum).getImm());
+      return false;
     case 'L': // The low 16 bits of an immediate constant.
     case 'm': // The base register of a memory operand.
     case 'M': // A register range suitable for LDM/STM.