Use trait-based profiling of SymbolRefs, avoiding calling getNumber() (which will soon be removed).

llvm-svn: 60577
diff --git a/clang/lib/Analysis/MemRegion.cpp b/clang/lib/Analysis/MemRegion.cpp
index d771526..99dc796 100644
--- a/clang/lib/Analysis/MemRegion.cpp
+++ b/clang/lib/Analysis/MemRegion.cpp
@@ -92,7 +92,7 @@
 
 void SymbolicRegion::ProfileRegion(llvm::FoldingSetNodeID& ID, SymbolRef sym) {
   ID.AddInteger((unsigned) MemRegion::SymbolicRegionKind);
-  ID.AddInteger(sym.getNumber());
+  ID.Add(sym);
 }
 
 void SymbolicRegion::Profile(llvm::FoldingSetNodeID& ID) const {