VS: Fix /analyze:log flag mapping (#14858)

Original header commits:
 v11/v12 commit v3.1.0-rc1~695^2
 v140/v141 commit v3.1.0-rc1~358^2~3

Fix the VS 11 and VS 12 flag table entries for this flag.  It requires
a value in the following argument.  Also drop the general "/analyze:"
flag table entry so that such flags will be passed through as plain
additional options.  This is necessary because some such options have
following values and some do not but not all have .vcxproj elements
to hold the values.