capture freezeGC in CPanic

src/cstate.c

@@ -12,6 +12,7 @@ CPanic *cosmoV_newPanic(CState *state)
     CPanic *panic = cosmoM_xmalloc(state, sizeof(CPanic));
     panic->top = state->top;
     panic->frameCount = state->frameCount;
+    panic->freezeGC = state->freezeGC;
     panic->prev = state->panic;
     state->panic = panic;
 

src/cstate.h

@@ -46,6 +46,7 @@ typedef struct CPanic
     StkPtr top;
     struct CPanic *prev;
     int frameCount;
+    int freezeGC;
 } CPanic;
 
 struct CState

src/cvm.c

@@ -122,6 +122,7 @@ void cosmoV_throw(CState *state)
     if (state->panic) {
         state->top = state->panic->top;
         state->frameCount = state->panic->frameCount;
+        state->freezeGC = state->panic->freezeGC;
         cosmoV_pushValue(state, val);
         longjmp(state->panic->jmp, 1);
     } else {