ares a symbol to be global.
The arguments are optional flags and the size of the data being declared as a global,
which will have initial value all zeros unless a <code>DATA</code> directive
has initialized it.
The <code>GLOBL</code> directive must follow any corresponding <code>DATA</code> directives.
This example
</p>

<pre>
GLOBL runtime·tlsoffset(SB),$4
</pre>

<p>
declares <code>runtime·tlsoffset</code> to have size 4.
</p>

<p>
There may be one or two arguments to the directives.
If there are two, t