Variable name cleanup in quick_dexcache_entrypoints

After aosp/1906478 we are using the caller rather than the outer
method but we didn't update the variable names.

Test: art/test/testrunner/testrunner.py --host --64 --optimizing -b
Change-Id: Ieaf73531350801e1c26d71a604dc9a17078ff989
1 file changed