[llvm] [BOLT][NFC] Store FILE symbols in a vector (PR #89088)

[Davide Italiano via llvm-commits]

dcci wrote:

> > > For reference, in one of our medium-sized test binaries we have:
> > 
> > 
> > Can we try on large binaries and try to have an upper bound on the size? I am not against this I just want to make sure we don't regress time dramatically.
> 
> For one large prod binary, we have the following:
> 
> * 2356369 local symbols,
> * 1327085 local function symbols,
> * 27784 file symbols.
> 

What's the BOLT processing time before/after the change?
100MB is a significant amount but how does it compare with BOLT's peak memory usage?

https://github.com/llvm/llvm-project/pull/89088