K 10
svn:author
V 3
pfg
K 8
svn:date
V 27
2015-03-26T16:00:35.475409Z
K 7
svn:log
V 713
Introduce some allocation function attributes.

Bring support for two gcc function attributes that are likely to be used
in our system headers:

__alloc_size
The alloc_size attribute is used to tell the compiler that the function
return value points to memory, where the size is given by one or two of
the functions parameters.

__result_use_check
Causes a warning to be emitted if a caller of the function with this
attribute does not use its return value. This is known in gcc as
"warn_unused_result" but we considered the original naming unsuitable
for an attribute.

The __alloc_size attribute required some workarounds for lint(1).
Both attributes are supported by clang.

Also see: D2107

MFC after:	3 days

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