Add guards for callsites depending on global object

In order to to share and reuse script classes (JDK-8021350) we need to add guards to callsites depending on the global object. This includes mostly global variables, but also primitives (depending on the global's primitive prototypes), variables declared in eval() etc.

Note that some globals properties that need to be guarded even within a single global currently are not (JDK-8034055)