[Demangle] remove itaniumFindTypesInMangledName

Summary:
This (very specialized) function was added to enable an LLDB use case.
Now that a more generic interface (overriding of parser functions -
D52992)  is available, and LLDB has been converted to use that (D54074),
the function is unused and can be removed.

Reviewers: erik.pilkington, sgraenitz, rsmith

Subscribers: mgorny, hiraditya, christof, libcxx-commits, llvm-commits

Differential Revision: https://reviews.llvm.org/D54893

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@347670 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/demangle/ItaniumDemangle.h b/src/demangle/ItaniumDemangle.h
index f992645..9e9d183 100644
--- a/src/demangle/ItaniumDemangle.h
+++ b/src/demangle/ItaniumDemangle.h
@@ -2162,9 +2162,6 @@
   // conversion operator's type, and are resolved in the enclosing <encoding>.
   PODSmallVector<ForwardTemplateReference *, 4> ForwardTemplateRefs;
 
-  void (*TypeCallback)(void *, const char *) = nullptr;
-  void *TypeCallbackContext = nullptr;
-
   bool TryToParseTemplateArgs = true;
   bool PermitForwardTemplateReferences = false;
   bool ParsingLambdaParams = false;
@@ -3458,9 +3455,6 @@
 Node *AbstractManglingParser<Derived, Alloc>::parseType() {
   Node *Result = nullptr;
 
-  if (TypeCallback != nullptr)
-    TypeCallback(TypeCallbackContext, First);
-
   switch (look()) {
   //             ::= <qualified-type>
   case 'r':