[llvm] [llvm-profgen] Filter out ambiguous cold profiles during profile generation (PR #81803)

[Lei Wang via llvm-commits]

wlei-llvm wrote:

> Thanks for looking into alternatives. Actually how about we add another function `FunctionSamples::RemoveCallSamples` to do this? We already have `removeCalledTargetAndBodySample`.

It'd probably also be hacky if we use an internal `RemoveCallSamples`, 
1) The current filter is to match a prefix not a exact callsite. the input parameter is a prefix/ or a list of prefix..

2) Or we can do a round of lookup for CallSamples to generate a list of `ToBeRemovedFS` Pointer... then pass them to  an internal `RemoveCallSamplesPointer` ... which looks too complicated.. 



https://github.com/llvm/llvm-project/pull/81803