Fill resolved static fields during class initialization

Previously everytime we resolved static fields we linear searched
the class to find the field with the specified field id. Now we
eagerly set these fields in the dex cache when we initialize classes.

FB launch timings before:
WaitTime: 2903
WaitTime: 2953
WaitTime: 2918
WaitTime: 2940
WaitTime: 2879
WaitTime: 2792

Timings after:
WaitTime: 2699
WaitTime: 2791
WaitTime: 2653
WaitTime: 2929
WaitTime: 2651
WaitTime: 2971

Perf before:
2.94% art::mirror::Class::FindDeclaredStaticField(art::mirror::DexCache const*, unsigned int)
After:
0.00% art::mirror::Class::FindDeclaredStaticField(art::mirror::DexCache const*, unsigned int)

Bug: 18054905
Bug: 16828525

Change-Id: I33255f85d10c29cae085584880196c45ac0ea230