[Patch,AVR] Support instrucions XCH, LAT, LAC, LAS

[Georg-Johann Lay]

This patch adds support for the XMEGA atomic memory instructions

o exchange
o load-and-set
o load-and-clear
o load-and-toggle


Johann


include/
	* opcode/avr.h (AVR_ISA_XCH): New define.
	(AVR_ISA_XMEGA): Use it.
	(XCH, LAS, LAT, LAC): New XMEGA opcodes.
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