Merge pull request #3613 from WalterBright/hpohl-opt

Increase allocation chunk size + minor refactoring
Merge pull request #3745 from economicmodeling/coverage_test_case

Added test case for druntime pull request 830.
Merge pull request #3746 from Safety0ff/test7068

Add regression test for bug 7068.
Merge pull request #3737 from 9rnsr/fix11066

Issue 11066 - Spurious warning 'statement is not reachable' with -profile
Merge pull request #3751 from lionello/fix13109

Issue 13109 - Show error on conflicting args -lib and -run
Merge pull request #3734 from 9rnsr/fix13082

Issue 13082 - Spurious error message with failed call to class ctor
Merge pull request #3749 from yebblies/valistfix

[DDMD] Remove extern "C" verror hacks now that va_list has been fixed
Merge pull request #3750 from Trass3r/master

use enums