s2: Crash observed...

[klauspost]

runtime.throw(0x7e4e72, 0x5)
	C:/hostedtoolcache/windows/go/1.15.11/x64/src/runtime/panic.go:1116 +0x79 fp=0xc00be4fc70 sp=0xc00be4fc40 pc=0x2c89f9
runtime.sigpanic()
	C:/hostedtoolcache/windows/go/1.15.11/x64/src/runtime/signal_windows.go:249 +0x24f fp=0xc00be4fca0 sp=0xc00be4fc70 pc=0x2def2f
github.com/klauspost/compress/s2.encodeBlockAsm4MB(0xc000244004, 0x200004, 0x200004, 0xc00c148000, 0x200000, 0x200000, 0x1301)
	D:/a/compress/compress/s2/encodeblock_amd64.s:1255 +0xd5 fp=0xc00be5fcc8 sp=0xc00be4fca0 pc=0x743db5
github.com/klauspost/compress/s2.encodeBlock(0xc000244004, 0x200004, 0x200004, 0xc00c148000, 0x200000, 0x200000, 0x17719f7275cc0480)
	D:/a/compress/compress/s2/encode_amd64.go:28 +0x1f9 fp=0xc00be5fd18 sp=0xc00be5fcc8 pc=0x715b39
github.com/klauspost/compress/s2.Encode(0xc000244000, 0x0, 0x200008, 0xc00c148000, 0x200000, 0x200000, 0xc00c106000, 0x20cfa, 0x40007)
	D:/a/compress/compress/s2/encode.go:51 +0x25f fp=0xc00be5fd98 sp=0xc00be5fd18 pc=0x70c5bf
github.com/klauspost/compress/s2.TestEncodeNoiseThenRepeats(0xc0000c5200)
	D:/a/compress/compress/s2/s2_test.go:738 +0x186 fp=0xc00be5fed0 sp=0xc00be5fd98 pc=0x7250c6