Bug 854029 - Allow use of non-gcthing values with RelocatableValue; r=billm

--HG--
rename : content/svg/content/src/SVGFEMorphologyElement.h => content/svg/content/src/nsSVGFilters.cpp
rename : content/svg/content/test/selectSubString-helper.svg => content/svg/content/test/getSubStringLength-helper.svg
rename : content/svg/content/test/test_selectSubString.xhtml => content/svg/content/test/test_getSubStringLength.xhtml
rename : intl/icu/source/config/mh-msys-msvc => intl/icu/source/config/mh-cygwin-msvc
rename : layout/reftests/svg/text/selectSubString-2-ref.svg => layout/reftests/svg/text/simple-selection.svg
extra : rebase_source : 39ef8fef55bf6e540d41e6d12a4e73859833c0a7