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/StackSlotColoring.cpp

@@ -86,10 +86,6 @@ namespace {
       MachineFunctionPass(ID), ColorWithRegs(false), NextColor(-1) {
         initializeStackSlotColoringPass(*PassRegistry::getPassRegistry());
       }
-    StackSlotColoring(bool RegColor) :
-      MachineFunctionPass(ID), ColorWithRegs(RegColor), NextColor(-1) {
-        initializeStackSlotColoringPass(*PassRegistry::getPassRegistry());
-      }
 
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.setPreservesCFG();
@@ -105,9 +101,6 @@ namespace {
     }
 
     virtual bool runOnMachineFunction(MachineFunction &MF);
-    virtual const char* getPassName() const {
-      return "Stack Slot Coloring";
-    }
 
   private:
     void InitializeSlots();
@@ -122,6 +115,7 @@ namespace {
 } // end anonymous namespace
 
 char StackSlotColoring::ID = 0;
+char &llvm::StackSlotColoringID = StackSlotColoring::ID;
 
 INITIALIZE_PASS_BEGIN(StackSlotColoring, "stack-slot-coloring",
                 "Stack Slot Coloring", false, false)
@@ -132,10 +126,6 @@ INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
 INITIALIZE_PASS_END(StackSlotColoring, "stack-slot-coloring",
                 "Stack Slot Coloring", false, false)
 
-FunctionPass *llvm::createStackSlotColoringPass() {
-  return new StackSlotColoring(/*RegColor=*/false);
-}
-
 namespace {
   // IntervalSorter - Comparison predicate that sort live intervals by
   // their weight.