[clang] [Serialization] Read the initializer for interesting static variables before consuming it (PR #92353)

[Kai Nacke via cfe-commits]

redstar wrote:

The lines you are trying to match are:

```
  call void @_Z6MakeVRffff(ptr dead_on_unwind writable sret(<4 x float>) align 16 %tmp, float noundef %0, float noundef %1, float noundef %2, float noundef %3)
  %4 = load <4 x float>, ptr %tmp, align 16
  store <4 x float> %4, ptr @_ZN21VectorSinConstantsSSE1AE, align 16
```

I am not sure what is the best way to integrate that into the patterns.

https://github.com/llvm/llvm-project/pull/92353