Add displ tag to stack pointer offset annotations to avoid ambiguity in case the same constant offset appears twice in an instruction.

Add SMPFunction::FindAllocPoint method to find end of stack frame allocation when it is done by pushes, e.g. in strpbrk().

Redefine stack regions from IDA perspective to ours by getting all callee-saved regs out of the locals area; move emission of annotations to SMPInstr class.