debug/gosym: fix missing symbol version for 1.2+ pclntab

Updates #37762

Change-Id: Ib587f472304a04ebd9794666228f81ae6cb5c2a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/422315
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>

src/debug/gosym/pclntab.go

@@ -312,11 +312,12 @@ func (t *LineTable) go12Funcs() []Func {
 		f.LineTable = t
 		f.FrameSize = int(info.deferreturn())
 		syms[i] = Sym{
-			Value:  f.Entry,
-			Type:   'T',
-			Name:   t.funcName(info.nameoff()),
-			GoType: 0,
-			Func:   f,
+			Value:     f.Entry,
+			Type:      'T',
+			Name:      t.funcName(info.nameoff()),
+			GoType:    0,
+			Func:      f,
+			goVersion: t.version,
 		}
 		f.Sym = &syms[i]
 	}

src/debug/gosym/pclntab_test.go

@@ -268,6 +268,20 @@ func TestPCLine(t *testing.T) {
 	}
 }
 
+func TestSymVersion(t *testing.T) {
+	skipIfNotELF(t)
+
+	table := getTable(t)
+	if table.go12line == nil {
+		t.Skip("not relevant to Go 1.2+ symbol table")
+	}
+	for _, fn := range table.Funcs {
+		if fn.goVersion == verUnknown {
+			t.Fatalf("unexpected symbol version: %v", fn)
+		}
+	}
+}
+
 // read115Executable returns a hello world executable compiled by Go 1.15.
 //
 // The file was compiled in /tmp/hello.go: