Commit: MSP430: GAS: Correct range check of imm20 operands

[Nick Clifton]

Hi Guys,

  I am applying the attached patch to fix the msp430 assembler's
  checking of 20-bit immediate values.  The code used to check
  for negative values less than -(0x7ffff) but this is incorrect
  as it does not allow -524289.

  Whilst correcting this, and adding a few extra lines to the MSP430
  testsuite to make sure that the checks work correctly I realised
  that it might not be obvious why positive values up to 0xfffff are
  allowed for a signed immediate field.  So I have added in a couple
  of comments explaining about the special native of hex constants
  in immediate fields.

Cheers
  Nick

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