[compiler-rt] [llvm] [Memprof] Adds instrumentation support for memprof with histograms. (PR #100834)

[Matthew Weingarten via llvm-commits]

mattweingarten wrote:

> Needs a test. E.g. see the instrumentation IR checking in llvm/test/Instrumentation/HeapProfiler/basic.ll.

Added basic-histogram.ll for testing

https://github.com/llvm/llvm-project/pull/100834