[clang] [llvm] [PowerPC] Add intrinsics for rldimi/rlwimi/rlwnm (PR #82968)

[Eli Friedman via cfe-commits]

================
@@ -10737,6 +10752,43 @@ SDValue PPCTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
       return DAG.getRegister(PPC::X13, MVT::i64);
     return DAG.getRegister(PPC::R2, MVT::i32);
 
+  case Intrinsic::ppc_rldimi: {
+    uint64_t SH = Op.getConstantOperandVal(3);
+    unsigned MB = 0, ME = 0;
+    if (!isContiguousMask(Op.getConstantOperandAPInt(4), MB, ME, 64) ||
+        ME != 63 - SH)
+      llvm_unreachable("invalid rldimi mask!");
----------------
efriedma-quic wrote:

Please use report_fatal_error for this sort of check.

https://github.com/llvm/llvm-project/pull/82968