Don't issue MissingAbstractMethodImpl warnings unless WholeProgram

Local linting just looks at the files that were changed,
so we dont always see the implementation of an abstract method.
Disable the warning in that case. We'll still catch it when
we do whole program linting later.

hphp/compiler/analysis/analysis_result.cpp

@@ -663,7 +663,7 @@ void AnalysisResult::analyzeProgram(bool system /* = false */) {
     for (StringToFunctionScopePtrMap::const_iterator iterMethod =
            methods.begin(); iterMethod != methods.end(); ++iterMethod) {
       FunctionScopePtr func = iterMethod->second;
-      if (!func->hasImpl() && needAbstractMethodImpl) {
+      if (Option::WholeProgram && !func->hasImpl() && needAbstractMethodImpl) {
         FunctionScopePtr tmpFunc =
           cls->findFunction(ar, func->getName(), true, true);
         always_assert(!tmpFunc || !tmpFunc->hasImpl());