De-constify pointers to Type since they can't be modified. NFC

This was already done in most places a while ago. This just fixes the ones that crept in over time.

llvm-svn: 243842
diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index 017dc24..3c56167 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -2905,7 +2905,7 @@
         }
       }
 
-      SmallPtrSet<const Type*, 4> Visited;
+      SmallPtrSet<Type*, 4> Visited;
       if (!Indices.empty() && !Ty->isSized(&Visited))
         return Error(ID.Loc, "base element of getelementptr must be sized");
 
@@ -5817,7 +5817,7 @@
     Indices.push_back(Val);
   }
 
-  SmallPtrSet<const Type*, 4> Visited;
+  SmallPtrSet<Type*, 4> Visited;
   if (!Indices.empty() && !Ty->isSized(&Visited))
     return Error(Loc, "base element of getelementptr must be sized");