fix(format): separate an empty TEXT body from the next block

The one-blank rule before a new block skipped every line that followed a
TEXT directive, not just the function's first label, so a TEXT with an
empty body ran straight into the next declaration.  The exemption now
applies to labels only, and the directive shapes around GLOBL and DATA
ranges are pinned.

Assisted-by: GLM 5.3

format/format.go

@@ -226,7 +226,7 @@ func normalizeSpacing(outs []outLine) string {
 		switch prev := outs[j-1]; {
 		case prev.kind == kBlank, prev.kind == kLabel:
 			continue // already separated, or stacked labels
-		case prev.kind == kDirective && strings.HasPrefix(prev.text, "TEXT"):
+		case prev.kind == kDirective && strings.HasPrefix(prev.text, "TEXT") && ol.kind == kLabel:
 			continue // the function's first label
 		}
 		insert[j] = true