Merge pull request #3934 from yebblies/issue13383

Issue 13383 - wrong code with -O with ints, longs and bitwise operations
Merge pull request #3941 from MartinNowak/fix13413

fix Issue 13413 - dmd does not follow symlink when searching for dmd.conf
Merge pull request #3910 from 9rnsr/fix13323

Issue 13323 - UDA applied to import statement causes compilation to fail without error
Merge pull request #3942 from 9rnsr/fix13415

[REG2.066] Issue 13415 - '-inline' causes wrong enclosing scope pointer for nested function called from templated struct
Merge pull request #3946 from 9rnsr/2.066

Cherry-picking commits from master to 2.066 branch (for the minor release 2.066.1)