Simplify MakeElfFileForJIT

We only ever pass single method info to the method and
I don't plan to use the method for anything more complex.

The JIT-related methods also know the relevant ElfTypes
at compile time, so some of the helpers are not needed.

Test: ./art/test.py -b -r -t 137
Change-Id: Ie7815a6427ac05be15a79adeb05dccc9150441d2
3 files changed