CheckClass: renamed Bool enum values (#8187)

In AIX, TRUE and FALSE are already defined in AIX system header files.
As a result, compiling cppcheck in AIX fails with the following errors:
```
/home/buildusr/cppcheck/lib/checkclass.h:231:38: error: expected identifier before numeric constant
  231 |     enum class Bool : std::uint8_t { TRUE, FALSE, BAILOUT };
      |                                      ^~~~
/home/buildusr/cppcheck/lib/checkclass.h:231:38: error: expected '}' before numeric constant
In file included from /home/buildusr/cppcheck/lib/astutils.cpp:37:
/home/buildusr/cppcheck/lib/checkclass.h:231:36: note: to match this '{'
  231 |     enum class Bool : std::uint8_t { TRUE, FALSE, BAILOUT };
      |                                    ^
In file included from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/10/include-fixed/wchar.h:50,
                 from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/10/include/c++/cwchar:44,
                 from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/10/include/c++/bits/postypes.h:40,
                 from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/10/include/c++/bits/char_traits.h:40,
                 from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/10/include/c++/string:40,
                 from /home/buildusr/cppcheck/lib/matchcompiler.h:23,
                 from /home/buildusr/cppcheck/build/lib/build/mc_astutils.cpp:1:
/home/buildusr/cppcheck/lib/checkclass.h:231:38: error: expected unqualified-id before numeric constant
  231 |     enum class Bool : std::uint8_t { TRUE, FALSE, BAILOUT };
      |                                      ^~~~
In file included from /home/buildusr/cppcheck/lib/astutils.cpp:37:
/home/buildusr/cppcheck/lib/checkclass.h:232:12: error: 'Bool' does not name a type; did you mean 'bool'?
  232 |     static Bool isInverted(const Token *tok, const Token *rhs);
      |            ^~~~
      |            bool
/home/buildusr/cppcheck/lib/checkclass.h:236:60: error: non-member function 'bool isMemberVar(const Scope*, const Token*)' cannot have cv-qualifier
  236 |     bool isMemberVar(const Scope *scope, const Token *tok) const;
      |                                                            ^~~~~
/home/buildusr/cppcheck/lib/checkclass.h:240:97: error: non-member function 'bool checkConstFunc(const Scope*, const Function*, MemberAccess&)' cannot have cv-qualifier
  240 |     bool checkConstFunc(const Scope *scope, const Function *func, MemberAccess& memberAccessed) const;
      |                                                                                                 ^~~~~
/home/buildusr/cppcheck/lib/checkclass.h:313:137: error: non-member function 'void initializeVarList(const Function&, std::__cxx11::list<const Function*>&, const Scope*, std::vector<Usage>&)' cannot have cv-qualifier
  313 |     void initializeVarList(const Function &func, std::list<const Function *> &callstack, const Scope *scope, std::vector<Usage> &usage) const;
      |                                                                                                                                         ^~~~~
/home/buildusr/cppcheck/lib/checkclass.h:344:1: error: expected declaration before '}' token
  344 | };
      | ^
```

In this PR, TRUE and FALSE is being renamed to True and False to resolve
this issue. Please let me know your suggestions or concerns on these
changes.

Author: reshmavk

lib/checkclass.cpp

@@ -1872,24 +1872,24 @@ CheckClass::Bool CheckClass::isInverted(const Token *tok, const Token *rhs)
                                                      || (Token::simpleMatch(itr->astOperand2(), "this") && Token::simpleMatch(itr->astOperand1(), "&") && Token::simpleMatch(itr->astOperand1()->next(), rhs->str().c_str(), rhs->str().size())))) {
             //Do nothing
         } else {
-            return Bool::BAILOUT;
+            return Bool::Bailout;
         }
     }
     if (res)
-        return Bool::TRUE;
-    return Bool::FALSE;
+        return Bool::True;
+    return Bool::False;
 }
 
 const Token * CheckClass::getIfStmtBodyStart(const Token *tok, const Token *rhs)
 {
     const Token *top = tok->astTop();
     if (Token::simpleMatch(top->link(), ") {")) {
         switch (isInverted(tok->astParent(), rhs)) {
-        case Bool::BAILOUT:
+        case Bool::Bailout:
             return nullptr;
-        case Bool::TRUE:
+        case Bool::True:
             return top->link()->next();
-        case Bool::FALSE:
+        case Bool::False:
             return top->link()->linkAt(1);
         }
     }

lib/checkclass.h

@@ -228,7 +228,7 @@ class CPPCHECKLIB CheckClass : public Check {
     bool hasAllocation(const Function *func, const Scope* scope, const Token *start, const Token *end) const;
     bool hasAllocationInIfScope(const Function *func, const Scope* scope, const Token *ifStatementScopeStart) const;
     static bool hasAssignSelf(const Function *func, const Token *rhs, const Token *&out_ifStatementScopeStart);
-    enum class Bool : std::uint8_t { TRUE, FALSE, BAILOUT };
+    enum class Bool : std::uint8_t { True, False, Bailout };
     static Bool isInverted(const Token *tok, const Token *rhs);
     static const Token * getIfStmtBodyStart(const Token *tok, const Token *rhs);