GAS/ARM Fix regression of handling "ldr, =" -> mvn

[Richard Earnshaw]

It turns out that one of my earlier patches has caused a regression for 
handling

	ldr	Rn, =-1

which should be translated into 

	mvn	Rn, #0

It turns out that there were no tests for this, or similar ldr = patterns.

The patch below fixes this and adds a new regression test so that it 
shouldn't happen again.

R.

	* tc-arm.c (do_ldst): Fix handling an immediate expression pseudo
	op that can be translated into a mvn instruction.

Testsuite:
	* gas/arm/ldconst.s gas/arm/ldconst.d: New files.  Test ldr with
	immediate pseudo-operations.
	* gas/arm/arm.exp: Run it.

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