Refactor optimization pass handling.

Refactor the optimization passes to explicitly use the passes. This commit
just re-implements the same passes as were already being run.

It also adds an option (behind `-Z`) to run the LLVM lint pass on the
unoptimized IR.

src/rustllvm/RustWrapper.cpp

@@ -1,4 +1,4 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#include "rustllvm.h"
+
 //===----------------------------------------------------------------------===
 //
 // This file defines alternate interfaces to core functions that are more
@@ -15,50 +17,6 @@
 //
 //===----------------------------------------------------------------------===
 
-#include "llvm/IR/InlineAsm.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/Linker.h"
-#include "llvm/PassManager.h"
-#include "llvm/IR/InlineAsm.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/Analysis/Verifier.h"
-#include "llvm/Analysis/Passes.h"
-#include "llvm/ADT/Triple.h"
-#include "llvm/ADT/DenseSet.h"
-#include "llvm/Assembly/Parser.h"
-#include "llvm/Assembly/PrintModulePass.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/FormattedStream.h"
-#include "llvm/Support/Timer.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Support/TargetSelect.h"
-#include "llvm/Support/TargetRegistry.h"
-#include "llvm/Support/SourceMgr.h"
-#include "llvm/Support/Host.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/DynamicLibrary.h"
-#include "llvm/Support/Memory.h"
-#include "llvm/ExecutionEngine/ExecutionEngine.h"
-#include "llvm/ExecutionEngine/JIT.h"
-#include "llvm/ExecutionEngine/JITMemoryManager.h"
-#include "llvm/ExecutionEngine/MCJIT.h"
-#include "llvm/ExecutionEngine/Interpreter.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm-c/Core.h"
-#include "llvm-c/BitReader.h"
-#include "llvm-c/Object.h"
-
-// Used by RustMCJITMemoryManager::getPointerToNamedFunction()
-// to get around glibc issues. See the function for more information.
-#ifdef __linux__
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#endif
-
 using namespace llvm;
 using namespace llvm::sys;