libgo: update to Go1.16beta1 release

This does not yet include support for the //go:embed directive added
in this release.

	* Makefile.am (check-runtime): Don't create check-runtime-dir.
	(mostlyclean-local): Don't remove check-runtime-dir.
	(check-go-tool, check-vet): Copy in go.mod and modules.txt.
	(check-cgo-test, check-carchive-test): Add go.mod file.
	* Makefile.in: Regenerate.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/280172

1 files changed, 5 insertions, 19 deletions

diff --git a/libgo/go/runtime/panic.go b/libgo/go/runtime/panic.go
index f6747f5..11396b4 100644
--- a/libgo/go/runtime/panic.go
+++ b/libgo/go/runtime/panic.go
@@ -210,6 +210,11 @@ func panicmem() {
 	panic(memoryError)
 }
 
+func panicmemAddr(addr uintptr) {
+	panicCheck2("invalid memory address or nil pointer dereference")
+	panic(errorAddressString{msg: "invalid memory address or nil pointer dereference", addr: addr})
+}
+
 // deferproc creates a new deferred function.
 // The compiler turns a defer statement into a call to this.
 // frame points into the stack frame; it is used to determine which
@@ -292,15 +297,6 @@ func newdefer() *_defer {
 		systemstack(func() {
 			d = new(_defer)
 		})
-		if debugCachedWork {
-			// Duplicate the tail below so if there's a
-			// crash in checkPut we can tell if d was just
-			// allocated or came from the pool.
-			d.heap = true
-			d.link = gp._defer
-			gp._defer = d
-			return d
-		}
 	}
 	d.heap = true
 	return d
@@ -1176,12 +1172,6 @@ func startpanic_m() bool {
 	}
 }
 
-// throwReportQuirk, if non-nil, is called by throw after dumping the stacks.
-//
-// TODO(austin): Remove this after Go 1.15 when we remove the
-// mlockGsignal workaround.
-var throwReportQuirk func()
-
 var didothers bool
 var deadlock mutex
 
@@ -1228,10 +1218,6 @@ func dopanic_m(gp *g, pc, sp uintptr) bool {
 
 	printDebugLog()
 
-	if throwReportQuirk != nil {
-		throwReportQuirk()
-	}
-
 	return docrash
 }