Eliminate dead LoadClass when pruning ClinitCheck.

Prebuilt sizes for aosp_taimen-userdebug:
 - before:
   arm/boot*.oat: 19192012
   arm64/boot*.oat: 22603096
 - after:
   arm/boot*.oat: 19150692 (-40KiB, -0.22%)
   arm64/boot*.oat: 22565976 (-36KiB, -0.16%)

Test: Add checker statements to 478-checker-clinit-check-pruning
Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 35772576
Change-Id: I2485e832e77b68357f3bc0268afa8bd6a87083d5
2 files changed