Clarify double GC (#478)

Author: jakebailey

cmd/tsgo/main.go

@@ -226,6 +226,7 @@ func main() {
 	totalTime := time.Since(startTime)
 
 	var memStats runtime.MemStats
+	// GC must be called twice to allow things to settle.
 	runtime.GC()
 	runtime.GC()
 	runtime.ReadMemStats(&memStats)

internal/binder/binder_test.go

@@ -29,7 +29,8 @@ func BenchmarkBind(b *testing.B) {
 
 			compilerOptions := &core.CompilerOptions{Target: core.ScriptTargetESNext, ModuleKind: core.ModuleKindNodeNext}
 
-			// The above parses do a lot of work; ensure GC is settled before we start collecting pefrormance data.
+			// The above parses do a lot of work; ensure GC is finished before we start collecting pefrormance data.
+			// GC must be called twice to allow things to settle.
 			runtime.GC()
 			runtime.GC()