[clang] [CIR] Add cir.lifetime.start and cir.lifetime.end Op (PR #199599)

[Sirui Mu via cfe-commits]

================
@@ -4193,6 +4193,21 @@ mlir::LogicalResult 
CIRToLLVMStackRestoreOpLowering::matchAndRewrite(
   return mlir::success();
 }
 
+mlir::LogicalResult CIRToLLVMLifetimeStartOpLowering::matchAndRewrite(
+    cir::LifetimeStartOp op, OpAdaptor adaptor,
+    mlir::ConversionPatternRewriter &rewriter) const {
+  rewriter.replaceOpWithNewOp<mlir::LLVM::LifetimeStartOp>(op,
+                                                           adaptor.getPtr());
+  return mlir::success();
+}
+
+mlir::LogicalResult CIRToLLVMLifetimeEndOpLowering::matchAndRewrite(
+    cir::LifetimeEndOp op, OpAdaptor adaptor,
+    mlir::ConversionPatternRewriter &rewriter) const {
+  rewriter.replaceOpWithNewOp<mlir::LLVM::LifetimeEndOp>(op, adaptor.getPtr());
+  return mlir::success();
+}
+
----------------
Lancern wrote:

LowerToLLVM for these two ops should be implementable via TableGen:

```
def CIR_LifetimeStartOp : CIR_Op<"lifetime.start"> {
  let llvmOp = "LifetimeStartOp";
}

def CIR_LifetimeEndOp : CIR_Op<"lifetime.end"> {
  let llvmOp = "LifetimeEndOp";
}
```

https://github.com/llvm/llvm-project/pull/199599
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