Reapply [memprof] Add YAML-based deserialization for MemProf profile (#117829) This patch adds YAML-based deserialization for MemProf profile. It's been painful to write tests for MemProf passes because we do not have a text format for the MemProf profile. We would write a test case in C++, run it for a binary MemProf profile, and then finally run a test written in LLVM IR with the binary profile. This patch paves the way toward YAML-based MemProf profile. Specifically, it adds new class YAMLMemProfReader derived from MemProfReader. For now, it only adds a function to parse StringRef pointing to YAML data. Subseqeunt patches will wire it to llvm-profdata and read from a file. The field names are based on various printYAML functions in MemProf.h. I'm not aiming for compatibility with the format used in printYAML, but I don't see a point in changing the field names. This iteration works around the unavailability of ScalarTraits<uintptr_t> on macOS.
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