VFS Tracer broke

Worse, the error message is unreadable (the text is confined to an itty-bitty square somehow). However, thanks to the UI Inspector, I can recover the HTML for the error message. (The whitespace was somewhat mangled, so I've tweaked it.)

```html

<!--
body { font-family: Segoe UI; font-size: 12pt; color: #d4d4d4 }
div { font-family: Segoe UI; font-size: 12pt; color: #d4d4d4 }
td { font-family: Segoe UI; font-size: 12pt; color: #d4d4d4 }
p { font-family: Segoe UI; font-size: 12pt; color: #d4d4d4 }
a { font-family: Segoe UI; font-size: 12pt; color: #ede891 }
code { font-size: 12pt }
ul { list-style: disc; margin-left: 15px }
-->



Detected a breaking change. Cannot find
com.intellij.psi.stubs.StubIndexImpl::createPsiNoLock.


```

However, it seems that this instance of `createPsiNoLock` is a copy and paste error: the method in question is actually named `processElements`:

https://github.com/google/ide-perf/blob/3610383c3ad69b7ad0509a881a033687a01194fa/src/main/java/com/google/idea/perf/vfstracer/VirtualFileTracer.kt#L252

It looks like this got moved to `com.intellij.psi.stubs.StubIndexEx#processElements` in commit
https://github.com/JetBrains/intellij-community/commit/7aa4148d5e746e99fe42cb229f33928d7549e606.