[Bug target/45475] target attribute use in libcpp breaks LTO bootstrap

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45475
Bug 45475 depends on bug 45325, which changed state.

Bug 45325 Summary: [4.9 Regression] target attribute doesn't work with -march=i586
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45325

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED