[opt] Remove an unused argument to runPassPipeline().

I have plans to use this API also in libLTO (and maybe lld).

llvm-svn: 280770
diff --git a/llvm/tools/opt/NewPMDriver.cpp b/llvm/tools/opt/NewPMDriver.cpp
index 223d960..acdf263 100644
--- a/llvm/tools/opt/NewPMDriver.cpp
+++ b/llvm/tools/opt/NewPMDriver.cpp
@@ -47,7 +47,7 @@
                         "pipeline for handling managed aliasing queries"),
                cl::Hidden);
 
-bool llvm::runPassPipeline(StringRef Arg0, LLVMContext &Context, Module &M,
+bool llvm::runPassPipeline(StringRef Arg0, Module &M,
                            TargetMachine *TM, tool_output_file *Out,
                            StringRef PassPipeline, OutputKind OK,
                            VerifierKind VK,