libdrgn: Ensure booleans are treated as primitives in C++

[ghost]

Booleans in C++ programs were not registering as primitives (i.e. .primitive was None on a boolean type). This has been remedied by treating bool as a keyword in C++, in much the same fashion that #158 added support for classes in C++.

Signed-off-by: Kevin Svetlitski svetlitski@meta.com

[ghost]

The build error from clang in CI is:

In file included from ../../libdrgn/language_c.c:1655:
./c_keywords.inc:6:19: error: initializer overrides prior initialization of this subobject [-Werror,-Winitializer-overrides]
[C_TOKEN_BOOL] = "bool",
^~~~~~
./c_keywords.inc:4:19: note: previous initialization is here
[C_TOKEN_BOOL] = "_Bool",

This is unfortunate. I would suggest that we just have entirely separate lists of keywords for C and C++ to resolve this, but that won't help address this with regards to C23 support for the same issue (without having to make a new struct drgn_language drgn_language_c23 that differs only in this respect), since it also makes bool a keyword .

[ghost]

I could just add a separate SPECIFIER_CPP_BOOL and C_TOKEN_CPP_BOOL if that's alright with you.

[ghost]

Might revisit this later, but for now this is too minor to be worth pursuing.