[ThinLTO] Correct counting of functions in inliner stats

[tejohnson]

Summary

Declarations need to be filtered out when counting functions.

[eraman]

LGTM

llvm/trunk/lib/Transforms/Utils/ImportedFunctionsInliningStatistics.cpp

if (!CallerNode.Imported) {
     // from map because Caller can disappear (and function name with it).
     NonImportedCallers.push_back(It->first());
   }
 }
 
 void ImportedFunctionsInliningStatistics::setModuleInfo(const Module &M) {
   ModuleName = M.getName();
   for (const auto &F : M.functions()) {
+    if (F.isDeclaration())
+      continue;
     AllFunctions++;
     ImportedFunctions += int(F.getMetadata("thinlto_src_module") != nullptr);
   }
 }
 static std::string getStatString(const char *Msg, int32_t Fraction, int32_t All,
                                  const char *PercentageOfMsg,
                                  bool LineEnd = true) {
   double Result = 0;

llvm/trunk/test/Transforms/Inline/inline_stats.ll

 }
 
 define void @internal3() {
     call fastcc void @external1()
     call fastcc void @external5()
     ret void
 }
 
+declare void @external_decl()
+
 define void @external1() alwaysinline !thinlto_src_module !0 {
     call fastcc void @internal2()
     call fastcc void @external2();
+    call void @external_decl();
     ret void
 }
 
 define void @external2() alwaysinline !thinlto_src_module !1 {
     ret void
 }
 
 define void @external3() alwaysinline !thinlto_src_module !1 {