[XRay][compiler-rt] Use DCHECK instead of assert(...) (NFC)
[XRay][compiler-rt] Use DCHECK instead of assert(...) (NFC)

Use DCHECK instead of assert(...) in the XRay runtime.

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@334002 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt