Currently, to efficiently check if a `ClassEntry`, such as one from an `InvokeInstruction`, is of a particular class, we use such a pattern (as seen in JEP 486 demo):

inst.owner().name().equalsString("java/lang/System")

This pattern has a few issues:

1. This is not straightforward. Users may be tempted to write

inst.owner().asSymbol().equals(CD_System)

unaware of the degraded performance from extra conversions.

2. We aim to reduce the use of "internal names" with encapsulation. Direct use of "java/lang/System" goes against this, and we have no constants offered to reduce such error-prone use of internal name.

Thus, I propose a new API in ClassEntry:

boolean equalsSymbol(ClassDesc)

that can be used conveniently to check the identity of a class entry with a clean syntax and better performance.

In addition, this applies to Method type/class name matching for UTF8, and other structures; for example, matching a method type for utf8 can be as simple as testing the initial `(` for the fast path. We should add these series of convenience methods to promote better usage habbits.