[RFA] Add stabs entries for coalesced symbols.

[Klee Dienes]

The following patch adds definitions for Mac OS X -style coalesced  
symbols to aout/stab.def and stabs.texinfo.  For general documentation  
on coalesced symbols, search for N_BNSYM in the following link:

http://web.mit.edu/darwin/src/modules/cctools/RelNotes/ 
Private_CompilerTools.html

I suspect there may be a better place to "Relocatable Symbol Blocks"  
section of the TeXinfo file, but I wasn't able to find it; I'm happy to  
move it elsewhere in the document if someone can tell me a better place.

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