remove obsolete TODO in the tiny.txt test

Since 1a8e32227f we have been setting line numbers on call sites, and
that line number is always the minimum value for -tiny: 1.

Still not as zero-overhead as the old mechanism which entirely deleted
line numbers, but a useless and small line number is still pretty good.

testdata/scripts/tiny.txt

@@ -6,11 +6,9 @@ garble -tiny build
 env GODEBUG='allocfreetrace=1,gcpacertrace=1,gctrace=1,inittrace=1,scavenge=1,scavtrace=1,scheddetail=1,schedtrace=10'
 ! exec ./main$exe
 stderr '^\(0x[\d\w]{4,8},0x[\d\w]{4,8}\)' # interfaces/pointers print correctly
-# TODO: Make -tiny remove all line information again.
-# Right now, we reset each declaration's start line to 1.
-# Better than nothing, but we could still make *all* line numbers 1.
-# stderr '^caller: \? 0$' # position info is removed
-stderr '^caller: \?\? ' # position info is removed
+# With -tiny, all line numbers are reset to 1.
+# Unfortunately, line comment directives don't allow erasing line numbers entirely.
+stderr '^caller: \?\? 1$' # position info is removed
 stderr '^recovered: ya like jazz?'
 ! stderr 'panic: oh noes' # panics are hidden