[M3commit] [modula3/cm3] 39cbbb: previously:

[jaykrell]

  Branch: refs/heads/master
  Home:   https://github.com/modula3/cm3
  Commit: 39cbbbe988fe56b6bf304630152d3ec8c71f5105
      https://github.com/modula3/cm3/commit/39cbbbe988fe56b6bf304630152d3ec8c71f5105
  Author: jaykrell <jay.krell at cornell.edu>
  Date:   2015-08-26 (Wed, 26 Aug 2015)

  Changed paths:
    M m3-sys/m3middle/src/Target.i3
    M m3-sys/m3middle/src/Target.m3

  Log Message:
  -----------
  previously:
 First_readable_addr = 4k * 8 on most targets
 First_readable_addr = 8k * 8 on sparc
 could be but isn't 8k on alpha/ia64

now:
 4k on all targets
 could be but isn't 8k on ia64/alpha/sparc

Test case is p263.

Still maybe want to eliminate it, but at least
all targets are now the same here.