[Statepoint] Clean up Statepoint.h: accessor names.

Use getFoo() as accessors consistently and some other naming changes.

llvm-svn: 236564
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 52a8c69..8eb2e68 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -2957,7 +2957,8 @@
   if (const IntrinsicInst *I = dyn_cast<IntrinsicInst>(V))
     if (I->getIntrinsicID() == Intrinsic::experimental_gc_relocate) {
       GCRelocateOperands RelocateInst(I);
-      return isDereferenceablePointer(RelocateInst.derivedPtr(), DL, Visited);
+      return isDereferenceablePointer(RelocateInst.getDerivedPtr(), DL,
+                                      Visited);
     }
 
   if (const AddrSpaceCastInst *ASC = dyn_cast<AddrSpaceCastInst>(V))