[embedded] Drop unnecessary eraseAllVTables() code

Author: kubamracek

include/swift/SIL/SILModule.h

@@ -839,9 +839,6 @@ class SILModule {
   /// Look up a specialized VTable
   SILVTable *lookUpSpecializedVTable(SILType classTy);
 
-  /// Remove all VTables and specialized VTables from the module.
-  void eraseAllVTables();
-
   /// Attempt to lookup the function corresponding to \p Member in the class
   /// hierarchy of \p Class.
   SILFunction *lookUpFunctionInVTable(ClassDecl *Class, SILDeclRef Member);

lib/SIL/IR/SILModule.cpp

@@ -484,16 +484,6 @@ SILVTable *SILModule::lookUpVTable(const ClassDecl *C,
   return Vtbl;
 }
 
-void SILModule::eraseAllVTables() {
-  for (auto vt : vtables)
-    vt->~SILVTable();
-
-  VTableMap.clear();
-  SpecializedVTableMap.clear();
-  vtables.clear();
-  VTableEntryCache.clear();
-}
-
 SILMoveOnlyDeinit *SILModule::lookUpMoveOnlyDeinit(const NominalTypeDecl *C,
                                                    bool deserializeLazily) {
   if (!C)