Fix undefined behavior due to deleting an object with a non-virtual

destructor via a pointer of the wrong static type.

This caused crashes during deallocation in C++14 builds when using a
deallocator whose sized delete requires the size argument to be correct.

Also make the LazyCallThroughManager destructor protected to catch this
sort of bug in the future.

Author: zygoloid

llvm/include/llvm/ExecutionEngine/Orc/LLJIT.h

@@ -250,7 +250,7 @@ class LLLazyJIT : public LLJIT {
   // Create a single-threaded LLLazyJIT instance.
   LLLazyJIT(LLLazyJITBuilderState &S, Error &Err);
 
-  std::unique_ptr<LazyCallThroughManager> LCTMgr;
+  std::unique_ptr<LocalLazyCallThroughManager> LCTMgr;
   std::unique_ptr<CompileOnDemandLayer> CODLayer;
 };
 
@@ -384,7 +384,7 @@ class LLLazyJITBuilderState : public LLJITBuilderState {
 
   Triple TT;
   JITTargetAddress LazyCompileFailureAddr = 0;
-  std::unique_ptr<LazyCallThroughManager> LCTMgr;
+  std::unique_ptr<LocalLazyCallThroughManager> LCTMgr;
   IndirectStubsManagerBuilderFunction ISMBuilder;
 
   Error prepareForConstruction();

llvm/include/llvm/ExecutionEngine/Orc/LazyReexports.h

@@ -56,6 +56,7 @@ class LazyCallThroughManager {
 
   LazyCallThroughManager(ExecutionSession &ES,
                          JITTargetAddress ErrorHandlerAddr, TrampolinePool *TP);
+  ~LazyCallThroughManager() = default;
 
   struct ReexportsEntry {
     JITDylib *SourceJD;
@@ -127,7 +128,7 @@ class LocalLazyCallThroughManager : public LazyCallThroughManager {
 
 /// Create a LocalLazyCallThroughManager from the given triple and execution
 /// session.
-Expected<std::unique_ptr<LazyCallThroughManager>>
+Expected<std::unique_ptr<LocalLazyCallThroughManager>>
 createLocalLazyCallThroughManager(const Triple &T, ExecutionSession &ES,
                                   JITTargetAddress ErrorHandlerAddr);
 

llvm/lib/ExecutionEngine/Orc/LazyReexports.cpp

@@ -98,7 +98,7 @@ void LazyCallThroughManager::resolveTrampolineLandingAddress(
       NoDependenciesToRegister);
 }
 
-Expected<std::unique_ptr<LazyCallThroughManager>>
+Expected<std::unique_ptr<LocalLazyCallThroughManager>>
 createLocalLazyCallThroughManager(const Triple &T, ExecutionSession &ES,
                                   JITTargetAddress ErrorHandlerAddr) {
   switch (T.getArch()) {