[eclipse-pmc] API addition for org.eclipse.jdt.core.IClassFile

[Olivier Thomann <Olivier_Thomann@xxxxxxxxxx>]

GOALS/BENEFITS:
- The Disassembler API requires a byte array to be passed in. Right now 
the JDT/UI code is using a deprecated API because they cannot access the 
bytes of the IClassFile object.
So the requested api is getBytes() on org.eclipse.jdt.core.IClassFile. See 
bug 150244.

AFFECTED BUGS:
- https://bugs.eclipse.org/bugs/show_bug.cgi?id=150244

RISKS:
No known risks. Once this is fixed, the disassembler will be tweaked to 
return a reasonable output.

PERFORMANCE IMPACTS:
- should not have an impact

Olivier