[llvm] [BOLT][AArch64] Introduce SPE mode in BasicAggregation (PR #120741)

[Amir Ayupov via llvm-commits]

aaupov wrote:

@paschalis-mpeis is there a way to configure SPE to only collect taken branches? My impression was that it's possible, e.g. based on this: https://community.arm.com/arm-community-blogs/b/tools-software-ides-blog/posts/introduction-to-statistical-profiling-support-in-streamline
> Event packets, which provide important information about each sampled instruction.
This information includes:
...
Was a mis-predicted or not-taken branch

But I couldn't find any info regarding configuring perf filter to collect it.

https://github.com/llvm/llvm-project/pull/120741