Checking if proxy_klass_head is still lambda_proxy_is_available

The `Shared Lambda Dictionary` section in the result of SharedLambdaDictionaryPrinter will mix normal klasses with lambda proxy klasses. Using the following commands can reproduce it:

Proc1: `./jshell` Proc2: `jcmd <proc1> VM.systemdictionary -verbose`

When all archived lambda proxy classes are used, proxy_klass_head(in RunTimeLambdaProxyClassInfo) is still referring to an instance klass that is no longer lambda_proxy_is_available, and its next_link will be set by classloader to link another normal class. Simply checking if proxy_klass_head is lambda_proxy_is_available can solve this problem.