(asm-calculate-indentation, asm-indent-line): New functions.

(asm-calculate-indentation, asm-indent-line): New functions.
(asm-mode): Use them in indent-line-function.
Set tab-always-indent to nil to stay closer to previous tab behavior.
Set comment-add.  Remove space at end of comment-add.
(asm-newline): Obsolete.  Use newline-and-indent instead.
(asm-mode-map): Remove TAB binding.
(asm-code-level-empty-comment-pattern)
(asm-flush-left-empty-comment-pattern)
(asm-inline-empty-comment-pattern): Remove.
(asm-comment): Use newcomment functions instead.
(asm-colon): Don't tab if colon is not after a label.
(asm-line-matches, asm-pop-comment-level): Remove.