[clr-interp] Fix emit of bb end var moves (#114267)

This code makes the current stack state match the stack state expected by a bblock that we transition to. The code was accidentally offseting from the current stack pointer, rather than from the base of the stack.

Author: BrzVlad

src/coreclr/interpreter/compiler.cpp

@@ -402,16 +402,16 @@ void InterpCompiler::EmitBBEndVarMoves(InterpBasicBlock *pTargetBB)
 
     for (int i = 0; i < pTargetBB->stackHeight; i++)
     {
-        int sVar = m_pStackPointer[i].var;
+        int sVar = m_pStackBase[i].var;
         int dVar = pTargetBB->pStackState[i].var;
         if (sVar != dVar)
         {
             InterpType interpType = m_pVars[sVar].interpType;
             int32_t movOp = InterpGetMovForType(interpType, false);
 
             AddIns(movOp);
-            m_pLastNewIns->SetSVar(m_pStackPointer[i].var);
-            m_pLastNewIns->SetDVar(pTargetBB->pStackState[i].var);
+            m_pLastNewIns->SetSVar(sVar);
+            m_pLastNewIns->SetDVar(dVar);
 
             if (interpType == InterpTypeVT)
             {