[verify-uselistorder] Support -force-opaque-pointers

By creating LLVMContext after parsing parameters.

llvm/test/Other/force-opaque-ptrs.ll

@@ -2,6 +2,7 @@
 ; RUN: llvm-as --force-opaque-pointers < %s | llvm-dis --force-opaque-pointers | FileCheck %s
 ; RUN: llvm-as < %s | llvm-dis --force-opaque-pointers | FileCheck %s
 ; RUN: opt --force-opaque-pointers < %s -S | FileCheck %s
+; RUN: verify-uselistorder --force-opaque-pointers < %s
 
 %ty = type i32*
 

llvm/tools/verify-uselistorder/verify-uselistorder.cpp

@@ -540,11 +540,10 @@ int main(int argc, char **argv) {
   // Enable debug stream buffering.
   EnableDebugBuffering = true;
 
-  LLVMContext Context;
-
   cl::ParseCommandLineOptions(argc, argv,
                               "llvm tool to verify use-list order\n");
 
+  LLVMContext Context;
   SMDiagnostic Err;
 
   // Load the input module...