[mlir][llvm] Fixes CallOp builder for the case of indirect call

Author: gitoleg

mlir/lib/Dialect/LLVMIR/IR/LLVMDialect.cpp

@@ -908,8 +908,9 @@ void CallOp::build(OpBuilder &builder, OperationState &state, TypeRange results,
 
 void CallOp::build(OpBuilder &builder, OperationState &state, TypeRange results,
                    FlatSymbolRefAttr callee, ValueRange args) {
+  auto fargs = callee ? args : args.drop_front();
   build(builder, state, results,
-        TypeAttr::get(getLLVMFuncType(builder.getContext(), results, args)),
+        TypeAttr::get(getLLVMFuncType(builder.getContext(), results, fargs)),
         callee, args, /*fastmathFlags=*/nullptr, /*branch_weights=*/nullptr,
         /*CConv=*/nullptr,
         /*access_groups=*/nullptr, /*alias_scopes=*/nullptr,