Fix #15165 Tokens copied by typedef lose their macro name - #8988

AI review

I found no correctness problems. Both changes now carry the macro name over to the copied tokens, and I found no input where the analysis results change.

One gap in test coverage: the new test simplifyTypedefMacroName only exercises the change in TypedefSimplifier::insertTokens (lib/tokenize.cpp). The change in TokenList::copyTokens (lib/tokenlist.cpp) is not tested by anything. If I revert it, every test still passes. That function is used by simplifyUsing, simplifyTypedefCpp, struct splitting and template alias and default-argument copying. Its effect is easy to see, for example with using F = void (*)(A x);, so a test for it would be worth adding.

Testing

Builds: make -j8 cppcheck testrunner succeeded in pr/, and make -j8 cppcheck succeeded in base/.

Unit tests:

• ./testrunner TestSimplifyTypedef TestSimplifyUsing TestTokenList TestSimplifyTemplate TestTokenizer: 937 tests, 0 failures.
• Full ./testrunner -q: 5388 tests, 0 failures.

Which change the new test covers:

• I temporarily reverted only the lib/tokenlist.cpp change and rebuilt. TestSimplifyTypedef still passed (0 failures), so the copyTokens change is untested.
• I temporarily reverted only the insertTokens change in lib/tokenize.cpp. simplifyTypedefMacroName then failed as expected.
• I restored both files and rebuilt afterwards.

The copyTokens path changes behaviour compared with base:

#define A int
using F = void (*)(A x);
void f(F g);

cppcheck --debug-normal t3.cpp:

• PR: void f ( void ( * g@var1 ) ( $int ) ) ;
• base: void f ( void ( * g@var1 ) ( int ) ) ;

Comparing results: I wrote a file that mixes macros with typedef/using arrays, anonymous struct typedefs, a typedef inside a macro, template default arguments from macros, and an unsigned typedef from a macro (d1.cpp). I ran it with --enable=all --inconclusive --check-level=exhaustive, and PR and base gave the same warnings. I also checked the --debug-normal output for typedef function pointers, arrays and struct typedefs. The $ markers now appear on the copied tokens, and I saw nothing wrong.

Automated review of 84bb93c by Claude. The pull request was built and tested locally.