JIT: support immediate stores
GekkoDisassembler: fix/improve disassembly for a few instructions
Merge pull request #1091 from FioraAeterna/fixdisasm

GekkoDisassembler: fix/improve disassembly for a few instructions
Merge pull request #805 from FioraAeterna/storerefactor

JIT: support immediate stores
Fix missing "return"
Merge pull request #1092 from comex/that-aint-ruby

Fix missing "return"