log: avoid stack lookups when not needed/used (#28069)

Avoids the somewhat expensive stack.Caller invocation by checking if it is needed

common/types_test.go

@@ -25,6 +25,7 @@ import (
 	"reflect"
 	"strings"
 	"testing"
+	"time"
 )
 
 func TestBytesConversion(t *testing.T) {
@@ -583,3 +584,14 @@ func TestAddressEIP55(t *testing.T) {
 		t.Fatal("Unexpected address after unmarshal")
 	}
 }
+
+func BenchmarkPrettyDuration(b *testing.B) {
+	var x = PrettyDuration(time.Duration(int64(1203123912312)))
+	b.Logf("Pre %s", time.Duration(x).String())
+	var a string
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		a = x.String()
+	}
+	b.Logf("Post %s", a)
+}