Finished asm_ahustore

Hello all,

I finished asm_ahustore and submitted a pull request. Apart from asm_ahustore, it contains some additional changes to the interpreter code, that caused me major problems. It enabled a few tests in the current test suite (array, hash and a few more), but it didn't solve everything for upvale tests, which fail because of asm_fuseahuref.

I thought to take a look at unimplemented paths of asm_fuseahuref, if that's alright with everybody.

Stefan