Fixed "@disable this" propagating through references (issue 8296)
fix Issue 12497 - ICE on string mixin with non-string operand
Merge pull request #3413 from 9rnsr/fix12497

[REG2.064] Issue 12497 - ICE on string mixin with non-string operand
Merge pull request #3411 from Ingrater/fix8296

Fixed "@disable this" propagating through references (issue 8296)