ir-emit: Elide unnecessary block labels
ir-emit.c: intset/vector annotations
More efficient block level analysis
Moved emitterFnAllocateStack to emitter-helpers.c
emitterWiden fix: output to block, not file
Removed some debug printfs from ir-emit and ir-opt
Added swap test
Forgotten frees
Moved emitterScopeAssignOffsets to emitter-helpers.c
asm-amd64.c: Removed some unnecessary (void) casts
emitterWiden: (void) ctx
Removed the operandFlags negation kludge