[x86/Linux] Fix crash when GC triggered inside funclets (#10188)

* [x86/Linux] Fix crash when GC triggered inside funclets

* [x86/Linux] Make main function not to report

src/vm/eetwain.cpp

@@ -4166,6 +4166,14 @@ bool EECodeManager::EnumGcRefs( PREGDISPLAY     pContext,
         GC_NOTRIGGER;
     } CONTRACTL_END;
 
+#ifdef WIN64EXCEPTIONS
+    if (flags & ParentOfFuncletStackFrame)
+    {
+        LOG((LF_GCROOTS, LL_INFO100000, "Not reporting this frame because it was already reported via another funclet.\n"));
+        return true;
+    }
+#endif // WIN64EXCEPTIONS
+
     GCInfoToken gcInfoToken = pCodeInfo->GetGCInfoToken();
     unsigned  curOffs = pCodeInfo->GetRelOffset();
 
@@ -4755,6 +4763,18 @@ bool EECodeManager::EnumGcRefs( PREGDISPLAY     pContext,
     _ASSERTE(*castto(table, unsigned short *)++ == 0xBABE);
 #endif
 
+#ifdef WIN64EXCEPTIONS   // funclets
+    //
+    // If we're in a funclet, we do not want to report the incoming varargs.  This is
+    // taken care of by the parent method and the funclet should access those arguments
+    // by way of the parent method's stack frame.
+    //
+    if(pCodeInfo->IsFunclet())
+    {
+        return true;
+    }
+#endif // WIN64EXCEPTIONS
+
     /* Are we a varargs function, if so we have to report all args
        except 'this' (note that the GC tables created by the x86 jit
        do not contain ANY arguments except 'this' (even if they