fix Issue 13093 - D ABI change for guaranteed efficient return of fixed size array
fix Issue 8307 - inconsistent treatment of auto functions
fix Issue 13336 - auto ref return deduced to be ref despite return value coercion
grammar/changelog for asm attributes
Merge pull request #651 from 9rnsr/fix13336

Issue 8307 and 13336 - fix documentation around return type inference and ref deduction
Merge pull request #611 from 9rnsr/fix13093

Issue 13093 - D ABI change for guaranteed efficient return of fixed size array
Merge pull request #667 from MartinNowak/asmAttribute

grammar/changelog for asm attributes