-void
-mono_x86_start_gsharedvt_call (GSharedVtCallInfo *info, gpointer *caller, gpointer *callee) MONO_INTERNAL;
+gpointer
+mono_x86_start_gsharedvt_call (GSharedVtCallInfo *info, gpointer *caller, gpointer *callee, gpointer mrgctx_reg) MONO_INTERNAL;