[patch,avr] Document how to avoid progmem on AVR_TINY.

[Georg-Johann Lay]

This adds to the documentation a hint how to set up a linker description 
file that avoids progmem altogether any without the usual overhead of 
locating read-only data in RAM.  The proposed linker description file is 
completely transparent to the compiler, and no start-up code has to be 
adjusted.

IIUC there are currently no plans to fix this in the default linker 
description file avrtiny.x, cf. http://sourceware.org/PR20849

Also, link between -mabsdata option and absdata variable attribute.

Ok for trunk?


Johann


gcc/
	* doc/invoke.texi (AVR Options) [-mabsdata]: Point to absdata.
	* doc/extend.texi (AVR Variable Attributes) [progmem]: Hint
	about linker description to avoid progmem altogether.
	[absdata]: Point to -mabsdata option.

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