[llvm] [Coverage] Move SingleByteCoverage out of CountedRegion (PR #110966)

[Ellis Hoag via llvm-commits]

================
@@ -1503,7 +1514,8 @@ CoverageData CoverageMapping::getCoverageForExpansion(
 
   LLVM_DEBUG(dbgs() << "Emitting segments for expansion of file "
                     << Expansion.FileID << "\n");
-  ExpansionCoverage.Segments = SegmentBuilder::buildSegments(Regions);
+  ExpansionCoverage.Segments =
+      SegmentBuilder::buildSegments(Regions, *SingleByteCoverage);
----------------
ellishg wrote:

Again, this will crash if `Expansion.Function.CountedRegions` is empty.

https://github.com/llvm/llvm-project/pull/110966