Revert "[analyzer] Prevent misuses of -analyze-function"

This reverts commit 9d6a615.

Exit Code: 1

Command Output (stderr):
--
/scratch/buildbot/bothome/clang-ve-ninja/llvm-project/clang/test/Analysis/analyze-function-guide.cpp:53:21: error: CHECK-EMPTY-NOT: excluded string found in input // CHECK-EMPTY-NOT: Every top-level function was skipped.
                    ^
<stdin>:1:1: note: found here
Every top-level function was skipped.
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Input file: <stdin>
Check file: /scratch/buildbot/bothome/clang-ve-ninja/llvm-project/clang/test/Analysis/analyze-function-guide.cpp

-dump-input=help explains the following input dump.

Input was:
<<<<<<
        1: Every top-level function was skipped.
not:53     !~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  error: no match expected
        2: Pass the -analyzer-display-progress for tracking which functions are analyzed.
>>>>>>

clang/lib/StaticAnalyzer/Frontend/AnalysisConsumer.cpp

@@ -501,28 +501,6 @@ static bool fileContainsString(StringRef Substring, ASTContext &C) {
   return Buffer.contains(Substring);
 }
 
-static void reportAnalyzerFunctionMisuse(const AnalyzerOptions &Opts,
-                                         const ASTContext &Ctx) {
-  llvm::errs() << "Every top-level function was skipped.\n";
-
-  if (!Opts.AnalyzerDisplayProgress)
-    llvm::errs() << "Pass the -analyzer-display-progress for tracking which "
-                    "functions are analyzed.\n";
-
-  bool HasBrackets =
-      Opts.AnalyzeSpecificFunction.find("(") != std::string::npos;
-
-  if (Ctx.getLangOpts().CPlusPlus && !HasBrackets) {
-    llvm::errs()
-        << "For analyzing C++ code you need to pass the function parameter "
-           "list: -analyze-function=\"foobar(int, _Bool)\"\n";
-  } else if (!Ctx.getLangOpts().CPlusPlus && HasBrackets) {
-    llvm::errs() << "For analyzing C code you shouldn't pass the function "
-                    "parameter list, only the name of the function: "
-                    "-analyze-function=foobar\n";
-  }
-}
-
 void AnalysisConsumer::runAnalysisOnTranslationUnit(ASTContext &C) {
   BugReporter BR(*Mgr);
   TranslationUnitDecl *TU = C.getTranslationUnitDecl();
@@ -559,14 +537,6 @@ void AnalysisConsumer::runAnalysisOnTranslationUnit(ASTContext &C) {
 
   BR.FlushReports();
   RecVisitorBR = nullptr;
-
-  // If the user wanted to analyze a specific function and the number of basic
-  // blocks analyzed is zero, than the user might not specified the function
-  // name correctly.
-  // FIXME: The user might have analyzed the requested function in Syntax mode,
-  // but we are unaware of that.
-  if (!Opts->AnalyzeSpecificFunction.empty() && NumFunctionsAnalyzed == 0)
-    reportAnalyzerFunctionMisuse(*Opts, *Ctx);
 }
 
 void AnalysisConsumer::reportAnalyzerProgress(StringRef S) {