[llvm] [SPIRV] Add bitreverse expansion for kernel (PR #186412)

[via llvm-commits]

================
@@ -0,0 +1,271 @@
+; Test bitreverse for all popular types (scalars and vectors of 8, 16, 32, 64 bits)
----------------
idubinov wrote:

support of i4 added, i128 - return false & TODO in code

https://github.com/llvm/llvm-project/pull/186412