[ARM] Follow-up to fix crash "-target arm -mcpu=generic", without "-march="
[ARM] Follow-up to fix crash "-target arm -mcpu=generic", without "-march="

Fix of dangling StringRef after temporary std::string is destroyed

Follow-up to: http://reviews.llvm.org/rL248479

Reviewers: alexfh

Subscribers: cfe-commits



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@248480 91177308-0d34-0410-b5e6-96231b3b80d8

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