[analyzer][NFC] Simplify PositiveAnalyzerOption handling (#121910)

This simplifies #120239
Addresses my comment at:
llvm/llvm-project#120239 (comment)

CPP-5920

Author: steakhal

clang/include/clang/StaticAnalyzer/Core/AnalyzerOptions.h

@@ -126,11 +126,18 @@ enum class CTUPhase1InliningKind { None, Small, All };
 
 class PositiveAnalyzerOption {
 public:
-  PositiveAnalyzerOption() = default;
-  PositiveAnalyzerOption(const PositiveAnalyzerOption &) = default;
-  PositiveAnalyzerOption &operator=(const PositiveAnalyzerOption &) = default;
+  constexpr PositiveAnalyzerOption() = default;
+  constexpr PositiveAnalyzerOption(unsigned Value) : Value(Value) {
+    assert(Value > 0 && "only positive values are accepted");
+  }
+  constexpr PositiveAnalyzerOption(const PositiveAnalyzerOption &) = default;
+  constexpr PositiveAnalyzerOption &
+  operator=(const PositiveAnalyzerOption &Other) {
+    Value = Other.Value;
+    return *this;
+  }
 
-  static std::optional<PositiveAnalyzerOption> create(unsigned Val) {
+  static constexpr std::optional<PositiveAnalyzerOption> create(unsigned Val) {
     if (Val == 0)
       return std::nullopt;
     return PositiveAnalyzerOption{Val};
@@ -141,11 +148,9 @@ class PositiveAnalyzerOption {
       return std::nullopt;
     return PositiveAnalyzerOption::create(Parsed);
   }
-  operator unsigned() const { return Value; }
+  constexpr operator unsigned() const { return Value; }
 
 private:
-  explicit constexpr PositiveAnalyzerOption(unsigned Value) : Value(Value) {}
-
   unsigned Value = 1;
 };
 

clang/lib/Frontend/CompilerInvocation.cpp

@@ -1274,9 +1274,7 @@ static void initOption(AnalyzerOptions::ConfigTable &Config,
     Diags->Report(diag::err_analyzer_config_invalid_input)
         << Name << "a positive";
 
-  auto Default = PositiveAnalyzerOption::create(DefaultVal);
-  assert(Default.has_value());
-  OptionField = Default.value();
+  OptionField = DefaultVal;
 }
 
 static void parseAnalyzerConfigs(AnalyzerOptions &AnOpts,

clang/unittests/StaticAnalyzer/Z3CrosscheckOracleTest.cpp

@@ -27,22 +27,13 @@ static constexpr std::optional<bool> UNDEF = std::nullopt;
 static unsigned operator""_ms(unsigned long long ms) { return ms; }
 static unsigned operator""_step(unsigned long long rlimit) { return rlimit; }
 
-template <class Ret, class Arg> static Ret makeDefaultOption(Arg Value) {
-  return Value;
-}
-template <> PositiveAnalyzerOption makeDefaultOption(int Value) {
-  auto DefaultVal = PositiveAnalyzerOption::create(Value);
-  assert(DefaultVal.has_value());
-  return DefaultVal.value();
-}
-
 static const AnalyzerOptions DefaultOpts = [] {
   AnalyzerOptions Config;
 #define ANALYZER_OPTION_DEPENDS_ON_USER_MODE(TYPE, NAME, CMDFLAG, DESC,        \
                                              SHALLOW_VAL, DEEP_VAL)            \
   ANALYZER_OPTION(TYPE, NAME, CMDFLAG, DESC, DEEP_VAL)
 #define ANALYZER_OPTION(TYPE, NAME, CMDFLAG, DESC, DEFAULT_VAL)                \
-  Config.NAME = makeDefaultOption<TYPE>(DEFAULT_VAL);
+  Config.NAME = DEFAULT_VAL;
 #include "clang/StaticAnalyzer/Core/AnalyzerOptions.def"
 
   // Remember to update the tests in this file when these values change.