runtime/pprof: delete unused locForPC
runtime/pprof: delete unused locForPC

Change-Id: Ie4754fefba6057b1cf558d0096fe0e83355f8eff
Reviewed-on: https://go-review.googlesource.com/c/go/+/205098
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Run-TryBot: Hyang-Ah Hana Kim <d7e82c3c07f92613bcbf9a1e88f6b96c13caa3b0@gmail.com>
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>

nawawi/go,cloudflare/go,golang/go,cloudflare/go,cloudflare/go,CAFxX/go,golang/go,cloudflare/go,akutz/go,golang/go,golang/go,akutz/go,akutz/go,nawawi/go,akutz/go,cloudflare/go,nawawi/go,nawawi/go,CAFxX/go,CAFxX/go,akutz/go,nawawi/go,akutz/go,CAFxX/go,nawawi/go,CAFxX/go,nawawi/go,golang/go,cloudflare/go,CAFxX/go,nawawi/go,CAFxX/go,golang/go,akutz/go,cloudflare/go,golang/go,golang/go,CAFxX/go,akutz/go,cloudflare/go