Request for review: 8007762: Rename a bunch of methods in size policy across collectors

[Tao Mao]

8007762: Rename a bunch of methods in size policy across collectors
https://jbs.oracle.com/bugs/browse/JDK-8007762

webrev:
http://cr.openjdk.java.net/~tamao/8007762/webrev.00/

changeset:
The motivation of this change is associated with CR 7098155 
(https://jbs.oracle.com/bugs/browse/JDK-7098155). For this, we need to 
split compute_generations_free_space into two routine (one for 
compute_eden_space_size and the other for 
compute_tenured_generation_free_space) in order to save some overhead 
when we want to compute only one of the two. The next step is to split 
PSAdaptiveSizePolicy::compute_generations_free_space(), which will be 
resolved in CR 8007763.

To unify the naming, a bunch of routines are renamed here.
(1) compute_*:
       compute_survivor_space_size_and_threshold()
       compute_generations_free_space() = compute_eden_space_size() + 
compute_tenured_generation_free_space()
(2) resize_*_gen:
       resize_young_gen()
       resize_tenured_gen()
(3) rename judging routine resize_geneneration() to need_resize() to 
avoid ambiguity

testing:
purely renaming; passed JPRT

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