riscv64: Implement `art_quick_update_inline_cache`.

Also change the codegen to put inline cache in the right
register and fix the codegen's `LoadMethod()`.

Test: # Cherry-pick
      #   https://android-review.googlesource.com/2727976 PS1,
      # then
      testrunner.py --target --64 --jit -t 004-InvokeInterface
Bug: 283082089
Change-Id: I4e188d21240536a0efdf039ff9911566f2a75360