step out of enum valueOf has wrong source

[andxu]

[akaroml]

@testforstephen please investigate and we'll figure out the right iteration for a fix later.

[testforstephen]

This is the jdi default behavior.
When dive into the stack frame returned by JVM, the location of the top frame really points to sourcename: EnumTest.java, line: 1, the debugger just render the stack frame according to the JDI results.

[testforstephen]

Reference to eclipse/intellij IDE, they both behave like above.