gccrs: fix segfault with empty cfg attribute #4263
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gcc/rust/ChangeLog: * ast/rust-ast.cc (Attribute::check_cfg_predicate): add cfg path in condition gcc/testsuite/ChangeLog: * rust/compile/issue-4261.rs: New test. Signed-off-by: Lucas Ly Ba <lucas.ly-ba@outlook.com>
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Fixes #4261
gcc/rust/ChangeLog:
gcc/testsuite/ChangeLog: