perf dso: Minor refactor to allow clang's Wthread-safety analysis

The pattern:

```
if (x) {
   lock(...)
}
block1;
if (x) {
   unlock(...)
}
```

defeats clang's -Wthread-safety analysis where it complains of locks
held on one path and not another.

Add helper functions for "block1" then restructure as:

```
if (x) {
   lock(...);
   block1();
   unlock(...);
} else {
   block1();
}
```

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: Bill Wendling <[email protected]>
Cc: Chaitanya S Prakash <[email protected]>
Cc: Fei Lang <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Justin Stitt <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephen Brennan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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