Codegen pass definition cleanup. No functionality.

Moving toward a uniform style of pass definition to allow easier target configuration.
Globally declare Pass ID.
Globally declare pass initializer.
Use INITIALIZE_PASS consistently.
Add a call to the initializer from CodeGen.cpp.
Remove redundant "createPass" functions and "getPassName" methods.

While cleaning up declarations, cleaned up comments (sorry for large diff).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150100 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineLICM.cpp

@@ -119,8 +119,6 @@ namespace {
 
     virtual bool runOnMachineFunction(MachineFunction &MF);
 
-    const char *getPassName() const { return "Machine Instruction LICM"; }
-
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.addRequired<MachineLoopInfo>();
       AU.addRequired<MachineDominatorTree>();
@@ -289,6 +287,7 @@ namespace {
 } // end anonymous namespace
 
 char MachineLICM::ID = 0;
+char &llvm::MachineLICMID = MachineLICM::ID;
 INITIALIZE_PASS_BEGIN(MachineLICM, "machinelicm",
                 "Machine Loop Invariant Code Motion", false, false)
 INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
@@ -297,10 +296,6 @@ INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
 INITIALIZE_PASS_END(MachineLICM, "machinelicm",
                 "Machine Loop Invariant Code Motion", false, false)
 
-FunctionPass *llvm::createMachineLICMPass() {
-  return new MachineLICM();
-}
-
 /// LoopIsOuterMostWithPredecessor - Test if the given loop is the outer-most
 /// loop that has a unique predecessor.
 static bool LoopIsOuterMostWithPredecessor(MachineLoop *CurLoop) {