K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2015-12-03T17:21:10.378019Z
K 7
svn:log
V 463
Pull vm_object_scan_all_shadowed out of vm_object_backing_scan

These two functions were largely unrelated, they just used the same same
loop logic to walk through a backing object's memq.  Pull out the
all_shadowed test as its own function and eliminate
OBSC_TEST_ALL_SHADOWED.  Rename vm_object_backing_scan to
vm_object_collapse_scan.

No functional change.

Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D4335

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