Merge 2018-11 LWG Motion 22

P0899R1 LWG 3016 is Not a Defect

Fixes #2428, fixes #1757

Author: zygoloid

source/utilities.tex

@@ -3877,8 +3877,6 @@
 memory, to allocate the contained value.
 The contained value shall be allocated in a region of the \tcode{variant}
 storage suitably aligned for all types in \tcode{Types...}.
-It is \impldef{whether \tcode{variant} supports over-aligned types}
-whether over-aligned types are supported.
 
 \pnum
 All types in \tcode{Types...} shall be (possibly cv-qualified)
@@ -17211,10 +17209,6 @@
 \end{codeblock}
 \end{note}
 
-\pnum
-It is \impldef{support for extended alignment} whether any extended alignment is
-supported\iref{basic.align}.
-
 \indexlibrary{\idxcode{common_type}}%
 \pnum
 Let: