Revert "cmd/compile: build compiler with PGO"

This reverts CL 495596.

Reason for revert: duplicate symbol failures in x/tools and random PPC crashes.

Change-Id: I57305f8e72ee1567dc5a6a829c2d70fb5719028a
Reviewed-on: https://go-review.googlesource.com/c/go/+/496185
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

src/cmd/compile/profile.sh

@@ -1,21 +0,0 @@
-# Copyright 2023 The Go Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
-
-# This script collects a CPU profile of the compiler
-# for building all targets in std and cmd, and puts
-# the profile at cmd/compile/default.pgo.
-
-dir=$(mktemp -d)
-cd $dir
-seed=$(date)
-
-for p in $(go list std cmd); do
-	h=$(echo $seed $p | md5sum | cut -d ' ' -f 1)
-	echo $p $h
-	go build -o /dev/null -gcflags=-cpuprofile=$PWD/prof.$h $p
-done
-
-go tool pprof -proto prof.* > $(go env GOROOT)/src/cmd/compile/default.pgo
-
-rm -r $dir

src/cmd/dist/buildtool.go

@@ -100,10 +100,6 @@ var ignorePrefixes = []string{
 var ignoreSuffixes = []string{
 	"_test.s",
 	"_test.go",
-	// Skip PGO profile. No need to build toolchain1 compiler
-	// with PGO. And as it is not a text file the import path
-	// rewrite will break it.
-	".pgo",
 }
 
 var tryDirs = []string{