// In order for GODEBUG=gcdead=1 to work, each bitmap needs
            // to contain information about all variables covered by the bitmap.
            // For local variables, the bitmap only covers the stkptrsize
            // bytes in the frame where variables containing pointers live.
            // For arguments and results, the bitmap covers all variables,
            // so we must include all the variables, even the ones without
            // pointers.

                // Ambiguously live variables are zeroed immediately after
                // function entry. Mark them live for all the non-entry bitmaps
                // so that GODEBUG=gcdead=1 mode does not poison them.