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runtime: improve "P has cached GC work" debug info

For #27993. Change-Id: I20127e8a9844c2c488f38e1ab1f8f5a27a5df03e Reviewed-on: https://go-review.googlesource.com/c/149968 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

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src/runtime
- mgc.go

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`‎src/runtime/mgc.go`

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Original file line number	Diff line number	Diff line change
`@@ -1934,6 +1934,19 @@ func gcMark(start_time int64) {`
`1934`	`1934`
`1935`	`1935`	`gcw := &p.gcw`
`1936`	`1936`	`if !gcw.empty() {`
	`1937`	`+ printlock()`
	`1938`	`+ print("runtime: P ", p.id, " flushedWork ", gcw.flushedWork)`
	`1939`	`+ if gcw.wbuf1 == nil {`
	`1940`	`+ print(" wbuf1=<nil>")`
	`1941`	`+ } else {`
	`1942`	`+ print(" wbuf1.n=", gcw.wbuf1.nobj)`
	`1943`	`+ }`
	`1944`	`+ if gcw.wbuf2 == nil {`
	`1945`	`+ print(" wbuf2=<nil>")`
	`1946`	`+ } else {`
	`1947`	`+ print(" wbuf2.n=", gcw.wbuf2.nobj)`
	`1948`	`+ }`
	`1949`	`+ print("\n")`
`1937`	`1950`	`throw("P has cached GC work at end of mark termination")`
`1938`	`1951`	`}`
`1939`	`1952`	`// There may still be cached empty buffers, which we`

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Commit 4d5791c

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`‎src/runtime/mgc.go`

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