Delete some dead code (#88139)

* Delete some dead code

* Delete comment referencing code that no longer exists

src/coreclr/vm/cgensys.h

@@ -63,10 +63,6 @@ extern "C" void STDCALL ExternalMethodFixupPatchLabel(void);
 extern "C" void STDCALL VirtualMethodFixupStub(void);
 extern "C" void STDCALL VirtualMethodFixupPatchLabel(void);
 
-extern "C" void STDCALL TransparentProxyStub(void);
-extern "C" void STDCALL TransparentProxyStub_CrossContext();
-extern "C" void STDCALL TransparentProxyStubPatchLabel(void);
-
 #ifdef FEATURE_READYTORUN
 extern "C" void STDCALL DelayLoad_MethodCall();
 

src/coreclr/vm/exceptionhandling.cpp

@@ -5763,12 +5763,6 @@ HijackHandler(IN     PEXCEPTION_RECORD   pExceptionRecord,
 // If the managed method will *NOT* be unwound by the current exception
 // pass we have an error: with no Frame on the stack to report it, the
 // managed method will not be included in the next stack walk.
-// An example of running into this issue was DDBug 1133, where
-// TransparentProxyStubIA64 had a personality routine that removed a
-// transition frame.  As a consequence the managed method did not
-// participate in the stack walk until the exception handler was called.  At
-// that time the stack walking code was able to see the managed method again
-// but by this time all references from this managed method were stale.
 BOOL IsSafeToUnwindFrameChain(Thread* pThread, LPVOID MemoryStackFpForFrameChain)
 {
     // Look for the last Frame to be removed that marks a managed-to-unmanaged transition

src/coreclr/vm/i386/cgencpu.h

@@ -491,8 +491,4 @@ inline BOOL ClrFlushInstructionCache(LPCVOID pCodeAddr, size_t sizeOfCode, bool
 // #define JIT_GetSharedGCStaticBaseNoCtor
 // #define JIT_GetSharedNonGCStaticBaseNoCtor
 
-#ifndef TARGET_UNIX
-#define JIT_NewCrossContext         JIT_NewCrossContext
-#endif // TARGET_UNIX
-
 #endif // __cgenx86_h__

src/coreclr/vm/jitinterface.h

@@ -184,12 +184,6 @@ EXTERN_C FCDECL1(void*, JIT_GetSharedNonGCStaticBaseNoCtor_Portable, DomainLocal
 extern FCDECL1(Object*, JIT_NewS_MP_FastPortable, CORINFO_CLASS_HANDLE typeHnd_);
 extern FCDECL1(Object*, JIT_New, CORINFO_CLASS_HANDLE typeHnd_);
 
-#ifndef JIT_NewCrossContext
-#define JIT_NewCrossContext JIT_NewCrossContext_Portable
-#endif
-EXTERN_C FCDECL1(Object*, JIT_NewCrossContext, CORINFO_CLASS_HANDLE typeHnd_);
-EXTERN_C FCDECL1(Object*, JIT_NewCrossContext_Portable, CORINFO_CLASS_HANDLE typeHnd_);
-
 extern FCDECL1(StringObject*, AllocateString_MP_FastPortable, DWORD stringLength);
 extern FCDECL1(StringObject*, UnframedAllocateString, DWORD stringLength);
 extern FCDECL1(StringObject*, FramedAllocateString, DWORD stringLength);

src/coreclr/vm/virtualcallstub.cpp

@@ -1758,15 +1758,6 @@ PCODE VirtualCallStubManager::ResolveWorker(StubCallSite* pCallSite,
                 }
             }
 
-            if (insertKind != DispatchCache::IK_NONE)
-            {
-                // Because the TransparentProxy MT is process-global, we cannot cache targets for
-                // unshared interfaces because there is the possibility of caching a
-                // <token, TPMT, target> entry where target is in AD1, and then matching against
-                // this entry from AD2 which happens to be using the same token, perhaps for a
-                // completely different interface.
-            }
-
             if (insertKind != DispatchCache::IK_NONE)
             {
                 VirtualCallStubManager * pMgrForCacheElem = this;