This adds a new ASTMatcher for CXXStdInitializerListExprs that matches C++ initializer list expressions.
The primary motivation is to use it to fix PR32896 (review here D32767).
Please add a test.
Please run docs/tools/dump_ast_matchers.py to update the docs.
I regenerated docs and added unit tests.
Thanks for help.
LGTM!
LG