Similarly to FIR diagnostic tests. This commit enable all available test
data and check the reported error messages by FIR. This helps identify
some issues in formatting of FIR diagnostics.
The changes on the test file are mechanically generated. Failed tests
are disabled with `// IGNORE_FIR` and are re-enabled in the second
commit.
- locals win
- unary calls to plus/minus are not supported in favor of unaryPlus/unaryMinus
- unqualified nested classes are temporarily reported as unresolved
- function without receiver win against extension function
- explicit import win against star import
Tianyu Geng