Failing to optimize getprop

Closure Compiler with advanced optimizations fails to optimize the expression `{a:0}.a` to `0` in some cases.

When running:
```bat
echo console.log({a:0}.a) | java -jar closure-compiler-v20191027.jar -O ADVANCED
```
I get `console.log({a:0}.a);`

but when running:
```bat
echo console.log({a:0}.a===0) | java -jar closure-compiler-v20191027.jar -O ADVANCED
```
I get `console.log(!0);`.

It seems that the compiler knows that `{a:0}.a` can be reduced to `0`, but doesn't always do it for no apparent reason.