Rename some GC classes so that their roll will hopefully be clearer.

In particular, Collector was confusing to implementors. Several
thought that this compile-time class was the place to implement
their runtime GC heap. Of course, it doesn't even exist at runtime.
Specifically, the renames are:

  Collector               -> GCStrategy
  CollectorMetadata       -> GCFunctionInfo
  CollectorModuleMetadata -> GCModuleInfo
  CollectorRegistry       -> GCRegistry
  Function::getCollector  -> getGC (setGC, hasGC, clearGC)

Several accessors and nested types have also been renamed to be
consistent. These changes should be obvious.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54899 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index d420ffb..938e1ae 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -133,7 +133,7 @@
     PM.add(createMachineFunctionPrinterPass(cerr));
   
   if (PrintGCInfo)
-    PM.add(createCollectorMetadataPrinter(*cerr));
+    PM.add(createGCInfoPrinter(*cerr));
   
   // Fold redundant debug labels.
   PM.add(createDebugLabelFoldingPass());
@@ -173,7 +173,7 @@
   if (MCE)
     addSimpleCodeEmitter(PM, Fast, PrintEmittedAsm, *MCE);
     
-  PM.add(createCollectorMetadataDeleter());
+  PM.add(createGCInfoDeleter());
 
   // Delete machine code for this function
   PM.add(createMachineCodeDeleter());
@@ -274,14 +274,14 @@
     PM.add(createMachineFunctionPrinterPass(cerr));
   
   if (PrintGCInfo)
-    PM.add(createCollectorMetadataPrinter(*cerr));
+    PM.add(createGCInfoPrinter(*cerr));
   
   if (addPreEmitPass(PM, Fast) && PrintMachineCode)
     PM.add(createMachineFunctionPrinterPass(cerr));
 
   addCodeEmitter(PM, Fast, PrintEmittedAsm, MCE);
   
-  PM.add(createCollectorMetadataDeleter());
+  PM.add(createGCInfoDeleter());
   
   // Delete machine code for this function
   PM.add(createMachineCodeDeleter());