[SampleFDO] Read call-graph matching recovered top-level function profile (#101053)

With extbinary profile format, initial profile loading only reads
profile based on current function names in the module. However, if a
function is renamed, sample loader skips to load its original
profile(which has a different name), we will miss this case. To address
this, we load the top-level profile candidate explicitly for the
matching. If a match is found later, the function profile will be
further preserved for use by the sample loader.

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