Fix PInvokeCalliFrame::UpdateRegDisplay on x86 (#99247)

Bug introduced by #57244

Fixes #99133

Author: jkotas

src/coreclr/vm/i386/cgenx86.cpp

@@ -766,7 +766,7 @@ void PInvokeCalliFrame::UpdateRegDisplay(const PREGDISPLAY pRD, bool updateFloat
     CONTRACT_END;
 
     VASigCookie *pVASigCookie = GetVASigCookie();
-    UpdateRegDisplayHelper(pRD, pVASigCookie->sizeOfArgs+sizeof(int));
+    UpdateRegDisplayHelper(pRD, pVASigCookie->sizeOfArgs);
 
     LOG((LF_GCROOTS, LL_INFO100000, "STACKWALK    PInvokeCalliFrame::UpdateRegDisplay(ip:%p, sp:%p)\n", pRD->ControlPC, pRD->SP));