[AArch64][v8.5A] Test optional Armv8.5-A random number extension
[AArch64][v8.5A] Test optional Armv8.5-A random number extension

The implementation of this is in TargetParser, so we only need to add a
test for it in clang.

Patch by Pablo Barrio!

Differential revision: https://reviews.llvm.org/D52492



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@343220 91177308-0d34-0410-b5e6-96231b3b80d8

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