Need an API in IsolateArgumentParser to return long typed option value

[ziyilin]

Feature request

Class com.oracle.svm.core.IsolateArgumentParser parses the options set at runtime for native image isolate. There are 4 options are currently supported, -Xmx, -Xms, -Xmn, and -XX:-AutomaticReferenceHandling. The first three of them are long typed, but there is only one getIntOptionValue method can return a integer typed option value.

Describe the solution you'd like. Add an API to return the long typed option value.

Express whether you'd like to help contributing this feature I have proposed a PR to fix this issue: https://github.com/oracle/graal/pull/4850

[oubidar-Abderrahim]

Thank you for your suggestion, we will take a look into it