When using agressive inlining -Xclang -mllvm -Xclang -inline-threshold=500,
this file takes 10-18 min to compile. This is caused by in-direct recursion.
Looks like transforming code to use templates and lambdas instead of
std::function and member function pointer reduces this time to 0.5s.
Fixes: #59658
C requires that enum values fit into an int. Scan the macro tokens
present in an initializing expression and reject macros that contain
tokens that have suffixes making them larger than int.
C forbids the comma operator in enum initializing expressions, so
optionally reject comma operator.
Differential Revision: https://reviews.llvm.org/D125622Fixes#55467
Add a recursive descent parser to match macro expansion tokens against
fully formed valid expressions of integral literals. Partial
expressions will not be matched -- they can't be valid initializing
expressions for an enum.
Differential Revision: https://reviews.llvm.org/D124500Fixes#55055
