...(ExprWithCleanups around the CXXConstructExpr in initializers for members of
O[U]String type, with older Clang, as used in
compilerplugins/clang/test/staticconstfield.cxx), and thus revert
e3e8d526 "Temporarily disable
compilerplugins/clang/test/staticconstfield" again.

Change-Id: Ic5fcdd1a26e4a6810369e4f9d909200d25feb12e
Reviewed-on: https://gerrit.libreoffice.org/63628
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>