The block_size seems to be not reliable, even after trying to more closely match
the interpreter by looking at the analysis for (addr+opcode->size-1) for detecting
the end of the block.
Since we need to "calculate" this number shortly before returning to
RunForCycles, it seemed logical to use the (up to now) unused return value
of the blocks.
Improves SMG2 here.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6266 8ced0084-cf51-0410-be5f-012b33b47a6e
34909ecebc