Fix AIX port.
* configure.ac (DATA_START, DATA_SEG_BITS): Set to 0x20000000 on AIX. (GC_MARK_STACK): Do not set to GC_USE_GCPROS_AS_BEFORE, as that runs afoul of some other bug in Emacs, and the default value GC_MAKE_GCPROS_NOOPS has been tested and works. * src/lisp.h (XPNTR) [!USE_LSB_TAG && DATA_SEG_BITS]: Fix bug introduced in 2012-07-27 change. DATA_SEG_BITS, if set, was #undeffed earlier, so it cannot be used as a macro here. Use the constant and not the macro. Tested on AIX. * src/unexaix.c: Revert 2013-02-11 and 2013-02-12 changes to this file. They're almost surely OK but we're just before a release so we should avoid changes unless they're clearly needed. Instead, make the following minor change: (ADDR_CORRECT): New macro. Fixes: debbugs:13650
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