[PATCH, alpha]: Simplify memory_barrier RTX

[Uros Bizjak]

Hello!

Attached patch simplifies alpha's memory_barrier insn RTX by removing
double mem:BLK operand modifier. This change makes alpha's
memory_barier implementation the same as x86's.

2008-12-12  Uros Bizjak  <ubizjak@gmail.com>

	* config/alpha/sync.md (memory_barrier): Remove mem:BLK from operands.
	Use Pmode for scratch reg.
	(*mb_internal): Use (match_dup 0) for unspec operand.

Patch was bootstrapped and regression tested on
alphaev56-unknown-linux-gnu cfarm machine. Patch is committed to
mainline SVN.

Uros.
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