This fixes github bug #98.
compiler/polymorphism.m:
Compiling gh98.m used to cause a compiler crash when the compiler
tried to look up info about a typeclass_info variable that was needed
in a call inside a lambda goal, but was not created inside the lambda goal.
It should therefore have been listed as a nonlocal of the lambda goal,
but it was not, because none of the variables inside the lambda goal
had the typeclass constraint represented by that typeclass_info var
on their types. And since later invocations of quantification may
reduce, but may not expand, the set of nonlocals in a rhs_lambda_goal
(as opposed to the nonlocals set of the unification whose RHS consists
of that rhs_lambda_goal), this problem stuck.
Fix this underestimation of the final lambda nonlocals set by including
in it all typeinfo and/or typeclass_info vars in the updated lambda goal.
Since this may then result in an overestimation, set a flag to force
a requantification of the whole procedure body once its polymorphism
transformation has been completed.
compiler/polymorphism_info.m:
Add a flag to force requantification.
compiler/goal_util.m:
Fix a misleading predicate name.
compiler/hlds_goal.m:
Fix documentation of rhs_lambda_goal.
compiler/hlds_out_goal.m:
Fix a layout problem in HLDS dumps.
compiler/hlds_pred.m:
compiler/lambda.m:
Fix misleading variable names.
tests/valid/gh98.m:
Add the github test case.
tests/valid/Mmakefile:
Enable the new test case.
