Get rid of newlines at the end of function names from nm symbolization

They were thrashing pprof's output

internal/binutils/addr2liner_nm.go

 		return nil, err
 	}
 
-	// Parse addr2line output and populate symbol map.
+	// Parse nm output and populate symbol map.
 	// Skip lines we fail to parse.
 	buf := bufio.NewReader(&b)
 	for {
 			}
 			return nil, err
 		}
+		line = strings.TrimSpace(line)
 		fields := strings.SplitN(line, " ", 3)
 		if len(fields) != 3 {
 			continue