[llvm] [AMDGPU] Make rotr illegal (PR #166558)

[Simon Pilgrim via llvm-commits]

================
@@ -1,5 +1,6 @@
 ; RUN: llc < %s -mtriple=r600 -mcpu=redwood | FileCheck %s
 ; RUN: llc < %s -mtriple=r600 -mcpu=cayman | FileCheck %s
+; XFAIL: *
----------------
RKSimon wrote:

Just regenerate?
```
; RUN: llc < %s -mtriple=r600 -mcpu=redwood | FileCheck %s --check-prefixes=EG
; RUN: llc < %s -mtriple=r600 -mcpu=cayman | FileCheck %s --check-prefixes=CM
```

https://github.com/llvm/llvm-project/pull/166558