code review 149260043: runtime: fix scanning of gc work buffer

src/runtime/mgc0.c

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // Garbage collector (GC).
 //
 // GC is:
 // - mark&sweep
 // - mostly precise (with the exception of some C-allocated objects, assembly frames/arguments, etc)
 // - parallel (up to MaxGcproc threads)
@@ skipping 1033 matching lines @@
 struct SweepData
 {
         G*      g;
         bool    parked;
 
         uint32  spanidx;        // background sweeper position
 
         uint32  nbgsweep;
         uint32  npausesweep;
 };
-
 SweepData runtime·sweep;
 
 // sweeps one span
 // returns number of pages returned to heap, or -1 if there is nothing to sweep
 uintptr
 runtime·sweepone(void)
 {
         MSpan *s;
         uint32 idx, sg;
         uintptr npages;
@@ skipping 853 matching lines @@
 void runtime·gc_unixnanotime(int64 *now);
 
 int64
 runtime·unixnanotime(void)
 {
         int64 now;
 
         runtime·gc_unixnanotime(&now);
         return now;
 }