InstrProf: Fix a misuse of the FunctionDecl API when generating coverage

This was calling FD->hasBody(), meaning "Does the function that this
decl refers to have a body?", rather than
FD->doesThisDeclarationHaveABody(), meaning "Is this decl a
non-deleted definition?".

We might want to consider renaming these APIs :/

llvm-svn: 243360

clang/lib/CodeGen/CodeGenModule.cpp

@@ -3406,7 +3406,7 @@ void CodeGenModule::AddDeferredUnusedCoverageMapping(Decl *D) {
   case Decl::ObjCMethod:
   case Decl::CXXConstructor:
   case Decl::CXXDestructor: {
-    if (!cast<FunctionDecl>(D)->hasBody())
+    if (!cast<FunctionDecl>(D)->doesThisDeclarationHaveABody())
       return;
     auto I = DeferredEmptyCoverageMappingDecls.find(D);
     if (I == DeferredEmptyCoverageMappingDecls.end())