Warning due to uninitialized value

[waywardmonkeys]

I get this on OS X when I build with my cmake build:

../src/s2wasm.h:957:65: warning: reference 'o' is not yet bound to a value when used here [-Wuninitialized]
      AsmConstWalker(S2WasmBuilder* parent) : parent(parent), o(o) {}

[kripken]

Thanks, that was partially-removed debug code.