[NFC][StaticDataProfileInfo] Refactor StaticDataProfileInfo::getConstantSectionPrefix and extract analysis based on PGO-counter to be a helper function (#162388)

`StaticDataProfileInfo::getConstantSectionPrefix` is used twice in
codegen ([1] and [2]) to emit section prefix for constants.

Before this patch, its implementation does analysis using PGO-counters,
and PGO-counters are only available on module-internal constants.

After this patch, the PGO-counter analysis are extracted to a helper
function, and returns enum rather than StringPrefix. This way, the
follow up patch https://github.com/llvm/llvm-project/pull/163325 can
extend this function to use global variable section prefix and compute a
max (the hotter one).

[1]
https://github.com/llvm/llvm-project/blob/975fba1b499422713e88cd6f374569f3bd38335e/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp#L3014-L3019
[2]
https://github.com/llvm/llvm-project/blob/975fba1b499422713e88cd6f374569f3bd38335e/llvm/lib/CodeGen/StaticDataAnnotator.cpp#L77-L84

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