[trivial] Fix warning in cast.c
fix Issue 13088 - Compiler segfaults with trivial case code
fix Issue 13087 - Error: no property 'xyz' for type 'Vec!4'
Merge pull request #3736 from 9rnsr/fix13087

[REG2.066a] Issue 13087 - Error: no property 'xyz' for type 'Vec!4'
fix Issue 13024 - [ICE](expression.c line 1172) with implicit supertype conversion of different enums in array literal
Merge pull request #3733 from 9rnsr/fix13024

[REG2.066a] Issue 13024 - [ICE](expression.c line 1172) with implicit supertype conversion of different enums in array literal
fix Issue 13074 - Old opCmp requirement for AA keys should be detected
Fixed build with XCode.
Merge pull request #3741 from yglukhov/xcode_fix

Fixed build with XCode.
Merge pull request #3731 from 9rnsr/fix13074

Issue 13074 - Old opCmp requirement for AA keys should be detected
Added test case for druntime pull request 830.
Merge pull request #3745 from economicmodeling/coverage_test_case

Added test case for druntime pull request 830.