[eclipse-pmc] API request to expose inferred return type information for

[Olivier Thomann <Olivier_Thomann@xxxxxxxxxx>]

We would like to expose the fact that the return type is inferred or not 
for a method invocation/super method invocation.
See https://bugs.eclipse.org/bugs/show_bug.cgi?id=174436

GOALS/BENEFITS:
- Allow better quickfix and refactoring. See 
https://bugs.eclipse.org/bugs/show_bug.cgi?id=174327

CORRESPONDING BUG:
174436 API request: Expression#resolveAssignmentTypeInference()
https://bugs.eclipse.org/bugs/show_bug.cgi?id=174436

RISKS:
- no risks

PERFORMANCE IMPACTS:
- no performance impact

Olivier