Add a _fixLifetime to stdlib/BridgeStorage.swift test.
Add a _fixLifetime to stdlib/BridgeStorage.swift test.

Otherwise, this uniqueness check will unexpectedly succeed when tests
run in optimize mode and 'c' is destroyed early:

      let c = C()
      var b = B(native: c, isFlagged: flag)
      //...
      expectFalse(b.isUniquelyReferencedUnflaggedNative())
      // Keep 'c' alive for the isUniquelyReferenced check above.
      _fixLifetime(c)

Fixes rdar://72957398 ([CanonicalOSSA] Add a _fixLifetime to
stdlib/BridgeStorage.swift test.)

tkremenek/swift,roambotics/swift,apple/swift,roambotics/swift,benlangmuir/swift,gregomni/swift,tkremenek/swift,xwu/swift,hooman/swift,roambotics/swift,roambotics/swift,rudkx/swift,JGiola/swift,glessard/swift,hooman/swift,gregomni/swift,apple/swift,tkremenek/swift,parkera/swift,parkera/swift,atrick/swift,xwu/swift,benlangmuir/swift,roambotics/swift,parkera/swift,apple/swift,hooman/swift,JGiola/swift,benlangmuir/swift,rudkx/swift,xwu/swift,ahoppen/swift,benlangmuir/swift,atrick/swift,gregomni/swift,ahoppen/swift,glessard/swift,apple/swift,ahoppen/swift,tkremenek/swift,JGiola/swift,ahoppen/swift,JGiola/swift,xwu/swift,atrick/swift,gregomni/swift,parkera/swift,atrick/swift,rudkx/swift,gregomni/swift,atrick/swift,parkera/swift,parkera/swift,benlangmuir/swift,hooman/swift,roambotics/swift,rudkx/swift,JGiola/swift,glessard/swift,glessard/swift,xwu/swift,glessard/swift,rudkx/swift,JGiola/swift,atrick/swift,glessard/swift,hooman/swift,apple/swift,hooman/swift,xwu/swift,parkera/swift,xwu/swift,tkremenek/swift,benlangmuir/swift,apple/swift,rudkx/swift,parkera/swift,gregomni/swift,hooman/swift,ahoppen/swift,tkremenek/swift,tkremenek/swift,ahoppen/swift