Revert "[llvm-profgen] Add --sample-period to estimate absolute counts (llvm#99826)"

This reverts commit 01d7836.

Author: tcreech-intel

llvm/test/tools/llvm-profgen/period-scaling.test

@@ -53,10 +53,6 @@ static cl::alias
                           cl::desc("Comma-delimited version of -perf-event"),
                           cl::aliasopt(PerfEventFilter));
 
-static cl::opt<uint64_t>
-    SamplePeriod("sample-period", cl::init(1),
-                 cl::desc("The sampling period (-c) used for perf data"));
-
 extern cl::opt<std::string> PerfTraceFilename;
 extern cl::opt<bool> ShowDisassemblyOnly;
 extern cl::opt<bool> ShowSourceLocations;
@@ -1004,16 +1000,6 @@ void LBRPerfReader::parseSample(TraceStream &TraceIt, uint64_t Count) {
   if (extractLBRStack(TraceIt, Sample->LBRStack)) {
     warnIfMissingMMap();
     // Record LBR only samples by aggregation
-    // If a sampling period is given we can adjust the magnitude of sample
-    // counts to estimate the absolute magnitute.
-    if (SamplePeriod.getNumOccurrences()) {
-      Count *= SamplePeriod;
-      // If counts are LBR-based, as opposed to IP-based, then the magnitude is
-      // now amplified by roughly the LBR stack size. By adjusting this down, we
-      // can produce LBR-based and IP-based profiles with comparable magnitudes.
-      if (!LeadingIPOnly && Sample->LBRStack.size() > 1)
-        Count /= (Sample->LBRStack.size() - 1);
-    }
     AggregatedSamples[Hashable<PerfSample>(Sample)] += Count;
   }
 }