[Coverage] Delete getCounterMismatches, it's dead code (NFC)

Exactly one counted region is inserted into a function record for every
region in a coverage mapping.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339193 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 4d56d49)

Author: vedantk

include/llvm/ProfileData/Coverage/CoverageMapping.h

@@ -510,7 +510,6 @@ class CoverageMapping {
   DenseMap<size_t, DenseSet<size_t>> RecordProvenance;
   std::vector<FunctionRecord> Functions;
   std::vector<std::pair<std::string, uint64_t>> FuncHashMismatches;
-  std::vector<std::pair<std::string, uint64_t>> FuncCounterMismatches;
 
   CoverageMapping() = default;
 
@@ -537,9 +536,7 @@ class CoverageMapping {
   ///
   /// This is a count of functions whose profile is out of date or otherwise
   /// can't be associated with any coverage information.
-  unsigned getMismatchedCount() const {
-    return FuncHashMismatches.size() + FuncCounterMismatches.size();
-  }
+  unsigned getMismatchedCount() const { return FuncHashMismatches.size(); }
 
   /// A hash mismatch occurs when a profile record for a symbol does not have
   /// the same hash as a coverage mapping record for the same symbol. This
@@ -549,14 +546,6 @@ class CoverageMapping {
     return FuncHashMismatches;
   }
 
-  /// A counter mismatch occurs when there is an error when evaluating the
-  /// counter expressions in a coverage mapping record. This returns a list of
-  /// counter mismatches, where each mismatch is a pair of the symbol name and
-  /// the number of valid evaluated counter expressions.
-  ArrayRef<std::pair<std::string, uint64_t>> getCounterMismatches() const {
-    return FuncCounterMismatches;
-  }
-
   /// Returns a lexicographically sorted, unique list of files that are
   /// covered.
   std::vector<StringRef> getUniqueSourceFiles() const;

lib/ProfileData/Coverage/CoverageMapping.cpp

@@ -239,11 +239,6 @@ Error CoverageMapping::loadFunctionRecord(
     }
     Function.pushRegion(Region, *ExecutionCount);
   }
-  if (Function.CountedRegions.size() != Record.MappingRegions.size()) {
-    FuncCounterMismatches.emplace_back(Record.FunctionName,
-                                       Function.CountedRegions.size());
-    return Error::success();
-  }
 
   Functions.push_back(std::move(Function));
   return Error::success();

tools/llvm-cov/CodeCoverage.cpp

@@ -362,12 +362,6 @@ std::unique_ptr<CoverageMapping> CodeCoverageTool::load() {
                << "No profile record found for '" << HashMismatch.first << "'"
                << " with hash = 0x" << Twine::utohexstr(HashMismatch.second)
                << '\n';
-
-      for (const auto &CounterMismatch : Coverage->getCounterMismatches())
-        errs() << "counter-mismatch: "
-               << "Coverage mapping for " << CounterMismatch.first
-               << " only has " << CounterMismatch.second
-               << " valid counter expressions\n";
     }
   }