cmd/compile: reduce garbage from autolabel

Follow-up to CL 26661

Change-Id: I67c58d17313094675cf0f30ce50d486818ae0dcb
Reviewed-on: https://go-review.googlesource.com/27113
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/src/cmd/compile/internal/gc/inl.go b/src/cmd/compile/internal/gc/inl.go
index ea49ae1..a669df8 100644
--- a/src/cmd/compile/internal/gc/inl.go
+++ b/src/cmd/compile/internal/gc/inl.go
@@ -766,7 +766,7 @@
 		ninit.Append(as)
 	}
 
-	retlabel := autolabel("i")
+	retlabel := autolabel(".i")
 	retlabel.Etype = 1 // flag 'safe' for escape analysis (no backjumps)
 
 	inlgen++