test & set ppc assembly (libgcj vs. threads)

[David Edelsohn]

	The PowerPC User's Manuals provide an example in the appendix:

loop:	lwarx	    r5, 0, r3	   # load and reserve
	cmpwi	    r5, 0	   # compare to zero
	bne	    $+12	   # done if not equal
	stwcx.	    r4, 0, r3	   # try to store non-zero
	bne-	    loop	   # loop if lost reservation

r3 = address
r4 = new value
r5 = old value

David

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