cmd/vendor: upgrade pprof to latest

This change upgrades the vendored pprof to pick up the fix for a
serious issue that made the source view in browser mode blank
(tracked upstream as google/pprof#621).

I also had to patch pprof.go, since one of the upstream commit we
included introduced a breaking change in the file interface (the Base
method is now called ObjAddr and has a different signature).

I've manually verified that the upgrade fixes the aforementioned
issues with the source view.

Fixes #45786

Change-Id: I00659ae539a2ad603758e1f06572374d483b9ddc
Reviewed-on: https://go-review.googlesource.com/c/go/+/318049
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>

Author: ALTree

src/cmd/go.mod

@@ -3,7 +3,7 @@ module cmd
 go 1.17
 
 require (
-	github.com/google/pprof v0.0.0-20210226084205-cbba55b83ad5
+	github.com/google/pprof v0.0.0-20210506205249-923b5ab0fc1a
 	github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639 // indirect
 	golang.org/x/arch v0.0.0-20210502124803-cbf565b21d1e
 	golang.org/x/crypto v0.0.0-20210503195802-e9a32991a82e // indirect

src/cmd/go.sum

@@ -1,8 +1,8 @@
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
-github.com/google/pprof v0.0.0-20210226084205-cbba55b83ad5 h1:zIaiqGYDQwa4HVx5wGRTXbx38Pqxjemn4BP98wpzpXo=
-github.com/google/pprof v0.0.0-20210226084205-cbba55b83ad5/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
+github.com/google/pprof v0.0.0-20210506205249-923b5ab0fc1a h1:jmAp/2PZAScNd62lTD3Mcb0Ey9FvIIJtLohPhtxZJ+Q=
+github.com/google/pprof v0.0.0-20210506205249-923b5ab0fc1a/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639 h1:mV02weKRL81bEnm8A0HT1/CAelMQDBuQIfLw8n+d6xI=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 golang.org/x/arch v0.0.0-20210502124803-cbf565b21d1e h1:pv3V0NlNSh5Q6AX/StwGLBjcLS7UN4m4Gq+V+uSecqM=

src/cmd/pprof/pprof.go

@@ -232,9 +232,9 @@ func (f *file) Name() string {
 	return f.name
 }
 
-func (f *file) Base() uint64 {
+func (f *file) ObjAddr(addr uint64) (uint64, error) {
 	// No support for shared libraries.
-	return 0
+	return 0, nil
 }
 
 func (f *file) BuildID() string {