public static boolean isStackVarnode(Varnode varnode) {
		return varnode != null &&
			varnode.getAddress().getAddressSpace().getType() == AddressSpace.TYPE_STACK;
	}
Returns a value specified in a {@link Language} definition via a
<pre>&lt;external_name tool="<b>name</b>" name="<b>value</b>"/&gt;</pre>
entry.

@param lang {@link Language} to query
@param name name of the value
@return String value
@throws IOException
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DWARFUtil.java