077940621d
This PR does reduces the verbosity of parser errors for OpenACC block constructs that do not parse correctly because they are missing their trailing end block directive by: - Removing the redundant error messages created by parsing 3 different styles of directive tokens. - Providing a general mechanism of configuring the max number of contexts printed for every syntax error. - Not printing less specific contexts that are at the same location. Prior to the changes: ``` $ flang -fc1 -fopenacc -fsyntax-only flang/test/Parser/acc-data-statement.f90 2>&1 | tee acc-data-statement.prior.log | wc -l 262 ``` [acc-data-statement.prior.log](https://github.com/user-attachments/files/19298165/acc-data-statement.prior.log) ``` $ flang -fc1 -fopenacc -fsyntax-only flang/test/Parser/acc-data-statement.f90 2>&1 | tee acc-data-statement.prior.log | wc -l 73 ``` [acc-data-statement.post.log](https://github.com/user-attachments/files/19298181/acc-data-statement.post.log)
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