frontend: #ifdef

fix

frontend: basic #include

lexer: fix scanning of pp directives in some circumstances

fix abi regs with aggregate return in hidden param

move definition of struct label

fix

make ptr offset in init take obj size into account

amd64: fix isel for numeric conversion ops

amd64: add mulf and divf codegen

hm

regalloc fixes and rpo

amd64/emit bugfix

amd64 codegen fixes

mem2reg; style

regalloc: update preds during simplify pass

fix copyopt

fix emit() setcc and copy

fix mem2reg ??

some frontend fixes