Fix #14629 syntaxError when not/compl is used as identifiers (C) (danmar#8384)

Fix false syntaxError when C alternative tokens (`not`/`compl`) are used
as identifiers (parameters)

**Minimal Example**
```
static void foo(int not, int test)
{
  test = not;
}
```

**Solution**
Add C-mode declaration guard to the not/compl branch in
`simplifyCAlternativeTokens()` and extend both guards to cover
last-parameter position.

Author: wilhelma

lib/tokenize.cpp

@@ -7819,7 +7819,7 @@ bool Tokenizer::simplifyCAlternativeTokens()
             alt.push_back(tok);
 
             // Is this a variable declaration..
-            if (isC() && Token::Match(tok->previous(), "%type%|* %name% [;,=]"))
+            if (isC() && Token::Match(tok->previous(), "%type%|* %name% [;,=)]"))
                 return false;
 
             if (!Token::Match(tok->previous(), "%name%|%num%|%char%|%str%|)|]|> %name% %name%|%num%|%char%|%op%|%str%|("))
@@ -7837,6 +7837,10 @@ bool Tokenizer::simplifyCAlternativeTokens()
         } else if (Token::Match(tok, "not|compl")) {
             alt.push_back(tok);
 
+            // Is this a variable/parameter declaration
+            if (isC() && Token::Match(tok->previous(), "%type%|* %name% [;,=)]"))
+                return false;
+
             if ((Token::Match(tok->previous(), "%assign%") || Token::Match(tok->next(), "%num%")) && !Token::Match(tok->next(), ".|->")) {
                 replaceAll = true;
                 continue;

test/testtokenize.cpp

@@ -5450,6 +5450,20 @@ class TestTokenizer : public TestFixture {
             ASSERT_EQUALS(exp, tokenizeAndStringify(code, dinit(TokenizeOptions, $.cpp = false)));
         }
 
+        { // not used as parameter name in C
+            const char code[] = "static void foo(int not, int test) {"
+                                "    test = not;"
+                                "}";
+            const char exp[] = "static void foo ( int not , int test ) { test = not ; }";
+            ASSERT_EQUALS(exp, tokenizeAndStringify(code, dinit(TokenizeOptions, $.cpp = false)));
+        }
+
+        { // binary alt token as last parameter in C
+            const char code[] = "void f(int or) { if (or) {} }";
+            const char exp[] = "void f ( int or ) { if ( or ) { } }";
+            ASSERT_EQUALS(exp, tokenizeAndStringify(code, dinit(TokenizeOptions, $.cpp = false)));
+        }
+
         //ASSERT_EQUALS("", filter_valueflow(errout_str()));
         ignore_errout();
     }