[PATCH] Disallow SYM = EXPR in bfin gas

[Jie Zhang]

Since Blackfin assembly uses equal sign '=' in almost all
instructions, without disabling SYM = EXPR, we cannot easily give good
diagnostic information if user has a typo in register name at the left
of '='. For example, user may want to write:

r0.l = 0x8000;

But write

r0.1 = 0x8000;

which would be a legal symbol assignment without this patch. Thus it
will be silently accepted without any error.

I have installed this patch to disable SYM = EXPR in bfin gas. So if
you want to set value to symbol, you have to use .set directive in
Blackfin assembly file.

Jie
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