cmd/compile: rename init function from init.ializers back to init

The name change init -> init.ializers was initially required for
initialization code.

With CL 161337 there's no wrapper code any more, there's a data
structure instead (named .inittask). So we can go back to just
plain init appearing in tracebacks.

RELNOTE=yes

Update #29919. Followon to CL 161337.

Change-Id: I5a4a49d286df24b53b2baa193dfda482f3ea82a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/167780
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/compile/internal/gc/init.go

@@ -46,7 +46,7 @@ func fninit(n []*Node) {
 	// Make a function that contains all the initialization statements.
 	if len(nf) > 0 {
 		lineno = nf[0].Pos // prolog/epilog gets line number of first init stmt
-		initializers := lookup("init.ializers")
+		initializers := lookup("init")
 		disableExport(initializers)
 		fn := dclfunc(initializers, nod(OTFUNC, nil, nil))
 		for _, dcl := range dummyInitFn.Func.Dcl {

src/fmt/errors_test.go

@@ -157,7 +157,7 @@ func TestErrorFormatter(t *testing.T) {
 		want: "fallback:" +
 			"\n    somefile.go:123" +
 			"\n  - file does not exist:" +
-			"\n    os.init.ializers" +
+			"\n    os.init" +
 			"\n        .+/os/error.go:\\d\\d",
 		regexp: true,
 	}, {

test/fixedbugs/issue29919.dir/a.go

@@ -34,8 +34,8 @@ func f() int {
 	if !strings.Contains(s, "a.go:19") {
 		panic("missing a.go:19")
 	}
-	if !strings.Contains(s, "a.init.ializers") {
-		panic("missing a.init.ializers")
+	if !strings.Contains(s, "a.init") {
+		panic("missing a.init")
 	}
 
 	// Check the CallersFrames results.
@@ -58,11 +58,11 @@ func f() int {
 		panic("traceback truncated after f")
 	}
 	f, more = iter.Next()
-	if f.Function != "a.init.ializers" || !strings.HasSuffix(f.File, "a.go") || f.Line != 15 {
-		panic(fmt.Sprintf("bad init.ializers %v\n", f))
+	if f.Function != "a.init" || !strings.HasSuffix(f.File, "a.go") || f.Line != 15 {
+		panic(fmt.Sprintf("bad init %v\n", f))
 	}
 	if !more {
-		panic("traceback truncated after init.ializers")
+		panic("traceback truncated after init")
 	}
 	f, _ = iter.Next()
 	if !strings.HasPrefix(f.Function, "runtime.") {