runtime: Don't get confused if m changes during runtime_gc.

From-SVN: r214048

diff --git a/libgo/runtime/mgc0.c b/libgo/runtime/mgc0.c
index 4b78f3bda56a2d37651ce28a2dc03116dfb79285..2d6328fbac3bb9c82df8d57dbe51e6f8c259a2cd 100644 (file)
--- a/libgo/runtime/mgc0.c
+++ b/libgo/runtime/mgc0.c
@@ -2204,6 +2204,7 @@ runtime_gc(int32 force)
                g->status = Gwaiting;
                g->waitreason = "garbage collection";
                runtime_mcall(mgc);
+               m = runtime_m();
        }
 
        // all done