cgen: prefer exact alias tags in sumtype match#27719
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Fixes #27718
This makes sumtype
matchbranch dispatch prefer the exact runtime tag when the branch type is itself a declared variant. Alias-compatible tag matching is still used as a fallback for aliases that are not explicit variants of the matched sum type.Tests:
./vnew vlib/v/tests/aliases/alias_is_match_runtime_tag_test.v./vnew -e <issue 27718 reproduction>./vnew -silent vlib/v/compiler_errors_test.v./vnew -silent vlib/v/gen/c/coutput_test.v./vnew -silent test vlib/v/