cmd/pprof: update vendored github.com/google/pprof

Pull in the latest published version of github.com/google/pprof
as part of the continuous process of keeping Go's dependencies
up to date.

For #36905.

[git-generate]
cd src/cmd
go get github.com/google/pprof@v0.0.0-20251114195745-4902fdda35c8
go mod tidy
go mod vendor

Change-Id: Id26eb632f637fb2c602d87cb83fdff7f099934ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/725500
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>

1 files changed, 30 insertions, 13 deletions

diff --git a/src/cmd/vendor/github.com/google/pprof/internal/graph/graph.go b/src/cmd/vendor/github.com/google/pprof/internal/graph/graph.go
index c4b0d4869f..ee7a700174 100644
--- a/src/cmd/vendor/github.com/google/pprof/internal/graph/graph.go
+++ b/src/cmd/vendor/github.com/google/pprof/internal/graph/graph.go
@@ -196,6 +196,21 @@ func (i *NodeInfo) NameComponents() []string {
 	return name
 }
 
+// comparePrintableName compares NodeInfo lexicographically the same way as `i.PrintableName() < right.PrintableName()`, but much more performant.
+func (i *NodeInfo) comparePrintableName(right NodeInfo) (equal bool, less bool) {
+	if right == *i {
+		return true, false
+	}
+
+	if i.Address != 0 && right.Address != 0 && i.Address != right.Address {
+		// comparing ints directly is the same as comparing padded hex from fmt.Sprintf("%016x", Address)
+		return false, i.Address < right.Address
+	}
+
+	// fallback
+	return false, i.PrintableName() < right.PrintableName()
+}
+
 // NodeMap maps from a node info struct to a node. It is used to merge
 // report entries with the same info.
 type NodeMap map[NodeInfo]*Node
@@ -583,17 +598,16 @@ func (nm NodeMap) findOrInsertLine(l *profile.Location, li profile.Line, o *Opti
 		objfile = m.File
 	}
 
-	if ni := nodeInfo(l, li, objfile, o); ni != nil {
-		return nm.FindOrInsertNode(*ni, o.KeptNodes)
-	}
-	return nil
+	ni := nodeInfo(l, li, objfile, o)
+
+	return nm.FindOrInsertNode(ni, o.KeptNodes)
 }
 
-func nodeInfo(l *profile.Location, line profile.Line, objfile string, o *Options) *NodeInfo {
+func nodeInfo(l *profile.Location, line profile.Line, objfile string, o *Options) NodeInfo {
 	if line.Function == nil {
-		return &NodeInfo{Address: l.Address, Objfile: objfile}
+		return NodeInfo{Address: l.Address, Objfile: objfile}
 	}
-	ni := &NodeInfo{
+	ni := NodeInfo{
 		Address:  l.Address,
 		Lineno:   int(line.Line),
 		Columnno: int(line.Column),
@@ -951,8 +965,9 @@ func (ns Nodes) Sort(o NodeOrder) error {
 				if iv, jv := abs64(l.Flat), abs64(r.Flat); iv != jv {
 					return iv > jv
 				}
-				if iv, jv := l.Info.PrintableName(), r.Info.PrintableName(); iv != jv {
-					return iv < jv
+				equal, leftLess := l.Info.comparePrintableName(r.Info)
+				if !equal {
+					return leftLess
 				}
 				if iv, jv := abs64(l.Cum), abs64(r.Cum); iv != jv {
 					return iv > jv
@@ -969,8 +984,9 @@ func (ns Nodes) Sort(o NodeOrder) error {
 				if iv, jv := abs64(l.Cum), abs64(r.Cum); iv != jv {
 					return iv > jv
 				}
-				if iv, jv := l.Info.PrintableName(), r.Info.PrintableName(); iv != jv {
-					return iv < jv
+				equal, leftLess := l.Info.comparePrintableName(r.Info)
+				if !equal {
+					return leftLess
 				}
 				return compareNodes(l, r)
 			},
@@ -1012,8 +1028,9 @@ func (ns Nodes) Sort(o NodeOrder) error {
 			if iv, jv := abs64(score[l]), abs64(score[r]); iv != jv {
 				return iv > jv
 			}
-			if iv, jv := l.Info.PrintableName(), r.Info.PrintableName(); iv != jv {
-				return iv < jv
+			equal, leftLess := l.Info.comparePrintableName(r.Info)
+			if !equal {
+				return leftLess
 			}
 			if iv, jv := abs64(l.Flat), abs64(r.Flat); iv != jv {
 				return iv > jv