[clang] [CIR] Upstream support for lowering cir.switch to LLVM (PR #140425)

[Andy Kaylor via cfe-commits]

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@@ -1038,6 +1038,37 @@ mlir::LogicalResult CIRToLLVMGlobalOpLowering::matchAndRewrite(
   return mlir::success();
 }
 
+mlir::LogicalResult CIRToLLVMSwitchFlatOpLowering::matchAndRewrite(
+    cir::SwitchFlatOp op, OpAdaptor adaptor,
+    mlir::ConversionPatternRewriter &rewriter) const {
+
+  llvm::SmallVector<mlir::APInt, 8> caseValues;
+  if (op.getCaseValues()) {
+    for (mlir::Attribute val : op.getCaseValues()) {
+      auto intAttr = dyn_cast<cir::IntAttr>(val);
+      caseValues.push_back(intAttr.getValue());
+    }
+  }
+
+  llvm::SmallVector<mlir::Block *, 8> caseDestinations;
+  llvm::SmallVector<mlir::ValueRange, 8> caseOperands;
+
+  for (mlir::Block *x : op.getCaseDestinations()) {
+    caseDestinations.push_back(x);
+  }
+
+  for (mlir::OperandRange x : op.getCaseOperands()) {
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andykaylor wrote:

No braces

https://github.com/llvm/llvm-project/pull/140425