[patch] Fix pr21328.

[Rafael Espíndola]

That PR reduces to us producing a relocation for

  .section foo,bar
La:
Lb:
 .long   La-Lb

but not for

  .section foo,bar
zed:
La:
Lb:
 .long   La-Lb

because we don't consider the space before the first visible symbol to
be an atom. My understanding is that it is a regular atom and no
relocation is necessary.

If that is the case, the attached patch fixes the bug.

Cheers,
Rafael
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