[patch] Thumb2 gas fixes

[Paul Brook]

The attached patch fixed 4 thumb2 gas bugs:

- Immediate operands allow shifted 8-bit constants, unlike arm which allows 
rotated constants.
- ALU operations do not allow shift by register operands.
- Incorrect encoding of shifted index addressing modes.
- Incorrect encoding of ldm and stm instructions

Tested on arm-none-eabi.
Ok?

Paul

2005-08-04  Paul Brook  <paul@codesourcery.com>

gas/
	* config/tc-arm.c (encode_thumb32_immediate): Only accept shifted
	constants.
	(encode_thumb32_shifted_operand): Prohibit register shifts.
	(encode_thumb32_addr_mode): Fix typo.
	(insns): Correct thumb2 ldm and stm opcodes.
gas/testsuite/
	* gas/arm/thumb32.d: Update ldm/stm dests.
	* gas/arm/thumb32.s: Ditto.
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