Handle another form of MOVW in ARM integrated assembler.

src/IceAssemblerARM32.h

Index: src/IceAssemblerARM32.h
diff --git a/src/IceAssemblerARM32.h b/src/IceAssemblerARM32.h
index 96e800b443e787702ba9db33ee651891b4abc3ef..a3a31f4e2d461eb58bb98a51a280336c5b7ad058 100644
--- a/src/IceAssemblerARM32.h
+++ b/src/IceAssemblerARM32.h
@@ -314,6 +314,12 @@ private:
 
   // Returns the offset encoded in the branch instruction Inst.
   static IOffsetT decodeBranchOffset(IValueT Inst);
+
+  // Implements movw, generating pattern ccccxxxxxxxsiiiiddddiiiiiiiiiiii where
+  // cccc=Cond, xxxxxxx<<21=Opcode, dddd=Rd, s=SetFlags, and
+  // iiiiiiiiiiiiiiii=Imm16.
+  void emitMovw(IValueT Opcode, IValueT Rd, IValueT Imm16, bool SetFlags,
+                CondARM32::Cond Cond);
 };
 
 } // end of namespace ARM32