runtime/pprof: print newly added fields of runtime.MemStats

in heap profile with debug mode

Change-Id: I3a80d03a4aa556614626067a8fd698b3b00f4290
Reviewed-on: https://go-review.googlesource.com/36962
Reviewed-by: Austin Clements <austin@google.com>

src/runtime/pprof/pprof.go

@@ -565,8 +565,12 @@ func writeHeap(w io.Writer, debug int) error {
 	fmt.Fprintf(w, "# OtherSys = %d\n", s.OtherSys)
 
 	fmt.Fprintf(w, "# NextGC = %d\n", s.NextGC)
+	fmt.Fprintf(w, "# LastGC = %d\n", s.LastGC)
 	fmt.Fprintf(w, "# PauseNs = %d\n", s.PauseNs)
+	fmt.Fprintf(w, "# PauseEnd = %d\n", s.PauseEnd)
 	fmt.Fprintf(w, "# NumGC = %d\n", s.NumGC)
+	fmt.Fprintf(w, "# NumForcedGC = %d\n", s.NumForcedGC)
+	fmt.Fprintf(w, "# GCCPUFraction = %v\n", s.GCCPUFraction)
 	fmt.Fprintf(w, "# DebugGC = %v\n", s.DebugGC)
 
 	tw.Flush()