runtime/pprof: regression in TestMemoryProfiler/debug=1 starting in April 2021

[2021-05-30T02:37:38-1607c28/linux-amd64-sid](https://build.golang.org/log/0e9976cb45203e355f17d2f78de336f584fc3510)
[2021-04-27T21:55:07-214c8dd/linux-amd64-nocgo](https://build.golang.org/log/52e66cc7e1c5a73b71c28ed3f066235ac524a59c)
[2021-04-27T21:44:16-645cb62/linux-amd64-nocgo](https://build.golang.org/log/690eb63a8bb5e8c856816e563f77e5b2a2804727)

This test has otherwise been passing consistently since it was last fixed in November 2019, so this looks like a 1.17 regression (CC @golang/release).

<details>
<summary>2019 failures</summary>

[2019-11-11T12:40:04-f07059d/linux-amd64-noopt](https://build.golang.org/log/27e0a831471988bd92143b88d0731068e1b91dd7)
[2019-11-10T20:36:44-47bc240/linux-amd64-noopt](https://build.golang.org/log/37e7d621778916613720422a594baca17fecc91e)
[2019-11-10T17:13:25-298be61/linux-amd64-noopt](https://build.golang.org/log/0bfe189f6147575d0df59c150bf0892c1a8503a8)
[2019-11-10T17:12:35-46c9fd0/linux-amd64-noopt](https://build.golang.org/log/045c009b5a4fcbc7c54f268873f9b4d2e2d267be)
[2019-11-10T17:12:15-40ebcfa/linux-amd64-noopt](https://build.golang.org/log/fc86467e001b704a1bc9ef71066f8216e28e53cc)
[2019-11-10T17:11:34-cd53fdd/linux-amd64-noopt](https://build.golang.org/log/57eff2aca04cf5dbdb8fbfcb15cdaf0f48074920)
[2019-11-10T13:41:45-4d4ddd8/linux-amd64-noopt](https://build.golang.org/log/88d2a8d9923cd7d31b5e65bfa260e51e60a2ab47)
[2019-11-10T12:12:46-9eb9c7b/linux-amd64-noopt](https://build.golang.org/log/70bc24dfc8608bbaf0fdd4d9dac44f66c16c8144)
[2019-11-10T04:23:22-e6fb39a/linux-amd64-noopt](https://build.golang.org/log/7bfac053cd4456f50ed744afee370ae0e26f1c1f)
[2019-11-09T22:14:01-78d4560/linux-amd64-noopt](https://build.golang.org/log/e72ac6364e88f2e50f57d219754c135834b4b215)
[2019-11-09T20:08:06-29cfb4d/linux-amd64-noopt](https://build.golang.org/log/f16bd56698181aa5e36be7278f3c35c8f8c9497c)
[2019-11-09T19:31:32-7148478/linux-amd64-noopt](https://build.golang.org/log/3ebda8de0cf048175daf3de12b4a3a1380e026c0)
[2019-11-09T19:25:46-6e11195/linux-amd64-noopt](https://build.golang.org/log/e8cb156218c607165c67981ae6dd4564a20de57c)
[2019-11-09T05:51:04-a0262b2/linux-amd64-noopt](https://build.golang.org/log/5b557cf5150e55636b38f1ed5467e101ad9c8f04)
[2019-11-09T00:36:15-bde1968/linux-amd64-noopt](https://build.golang.org/log/4fd6ce69c9c8bbe7a1fe658b4c59606a4b23efa4)
[2019-11-08T23:22:06-11da2b2/linux-amd64-noopt](https://build.golang.org/log/e87011043b3591561cee9e4d27aa10533a8614fe)
[2019-11-08T22:44:29-42db1da/linux-amd64-noopt](https://build.golang.org/log/54fa4af62ca5d1b60fb2513d95a6df88657b6f95)
[2019-11-08T21:32:23-0bbcce9/linux-amd64-noopt](https://build.golang.org/log/a18a88719f57775efde07e3f55dcec20ba418452)
[2019-11-08T21:27:51-b7d097a/linux-amd64-noopt](https://build.golang.org/log/fb85fc1bd60a611debe44f8ca6ce2b2ea95dd1d9)
[2019-11-08T21:05:17-9ee6ba0/linux-amd64-noopt](https://build.golang.org/log/8294df151d22112a906548c022c3d7c37f1c8455)
[2019-11-08T20:50:17-9e914f5/linux-amd64-noopt](https://build.golang.org/log/7169bfc72ea5938cfd1c9c97b63a894e63b9bbb1)
[2019-11-08T20:24:43-bababde/linux-amd64-noopt](https://build.golang.org/log/c139ea73e96ed7664fc4178316c577d88267e4d1)
[2019-11-08T20:05:25-7a5e0fe/linux-amd64-noopt](https://build.golang.org/log/901a9d2c39c260e2f8bbcf0a57416d3af9fb3b03)
[2019-11-08T19:28:57-904e113/linux-amd64-noopt](https://build.golang.org/log/5dd7fde47609c96c31dcefcd967bf4a5a1f02e52)
[2019-11-08T19:28:49-f6ff806/linux-amd64-noopt](https://build.golang.org/log/3d112175e99d408169d28640a837180051e435de)
[2019-11-08T19:24:30-e6c12c3/linux-amd64-noopt](https://build.golang.org/log/b7aaac9bb6ca3c6f4d88297be283110a5339ca64)
[2019-11-08T18:55:44-b2b0992/linux-amd64-noopt](https://build.golang.org/log/3806c916cbada9c9fc0e51dae5947dd1e0a8028a)
[2019-11-08T18:00:31-c444ec3/linux-amd64-noopt](https://build.golang.org/log/2ea6b08fb48d8ec00bf81769629bdb8ad99f8587)
[2019-11-08T17:56:35-a84ac18/linux-amd64-noopt](https://build.golang.org/log/b15ca449e59e4b5b919a638dc2a0c160ebd3d084)
[2019-11-08T17:01:32-4517c02/linux-amd64-noopt](https://build.golang.org/log/5628b727609ba14991f860a4b24f41e4e4e9cf52)
[2019-11-08T17:01:05-a5a6f61/linux-amd64-noopt](https://build.golang.org/log/1130864e4df6cc838014f704d8bb2f71389f789a)
[2019-11-08T17:00:57-dac936a/linux-amd64-noopt](https://build.golang.org/log/af63b11393970f3f75f68f938584fb178b170478)
[2019-11-08T16:46:24-47232f0/linux-amd64-noopt](https://build.golang.org/log/624de31db7d224e62eeb531e22cd2989b4b2549a)
[2019-11-08T16:44:48-374c284/linux-amd64-noopt](https://build.golang.org/log/8baf434a4e9ea91c9031b9cf361404c2f446e410)
[2019-11-08T16:35:48-ffb5646/linux-amd64-noopt](https://build.golang.org/log/e97a3388ca8271deb1df837b6bb5e17fadb1f034)
[2019-11-08T15:10:39-52aebe8/linux-amd64-noopt](https://build.golang.org/log/39564c7eaa56fd59c8354196abb0742bfcb1bcfe)
[2019-09-19T20:26:22-1c50fcf/netbsd-arm-bsiegert](https://build.golang.org/log/5dee773bf0ad34aeddf0a1eeb28f5552300fddf1)

</details>

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runtime/pprof: regression in TestMemoryProfiler/debug=1 starting in April 2021 #46500

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runtime/pprof: regression in TestMemoryProfiler/debug=1 starting in April 2021 #46500

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