[clang] [CIR] Implement null check for CXXNewExpr (PR #192848)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/test/CIR/CodeGen/new-null.cpp clang/include/clang/CIR/MissingFeatures.h clang/lib/CIR/CodeGen/CIRGenExprCXX.cpp --diff_from_common_commit
``````````

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changing `origin/main` to the base branch/commit you want to compare against.
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CIR/CodeGen/CIRGenExprCXX.cpp b/clang/lib/CIR/CodeGen/CIRGenExprCXX.cpp
index 356198f04..78feb7624 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprCXX.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprCXX.cpp
@@ -1510,8 +1510,7 @@ mlir::Value CIRGenFunction::emitCXXNewExpr(const CXXNewExpr *e) {
     enterNewDeleteCleanup(*this, e, allocation, allocSize, allocAlign,
                           allocatorArgs);
     operatorDeleteCleanup = ehStack.stable_begin();
-    cleanupDominator =
-        cir::UnreachableOp::create(builder, loc).getOperation();
+    cleanupDominator = cir::UnreachableOp::create(builder, loc).getOperation();
   }
 
   if (allocSize != allocSizeWithoutCookie) {
@@ -1533,9 +1532,8 @@ mlir::Value CIRGenFunction::emitCXXNewExpr(const CXXNewExpr *e) {
   // If we're inside a new delete cleanup, store the result pointer.
   Address resultPtr = Address::invalid();
   if (useNewDeleteCleanup) {
-    resultPtr =
-        createTempAlloca(builder.getPointerTo(elementTy), result.getAlignment(),
-                         loc, "__new_result");
+    resultPtr = createTempAlloca(builder.getPointerTo(elementTy),
+                                 result.getAlignment(), loc, "__new_result");
     builder.createStore(loc, result.getPointer(), resultPtr);
   }
 
@@ -1579,9 +1577,8 @@ mlir::Value CIRGenFunction::emitCXXNewExpr(const CXXNewExpr *e) {
     if (allocPtr.getType() != resultTy)
       allocPtr = builder.createBitcast(allocPtr, resultTy);
     mlir::Value nullPtr = builder.getNullPtr(resultTy, loc).getResult();
-    resultValue =
-        builder.createSelect(loc, nullCheckOp.getCondition(), allocPtr,
-                             nullPtr);
+    resultValue = builder.createSelect(loc, nullCheckOp.getCondition(),
+                                       allocPtr, nullPtr);
   }
 
   return resultValue;

``````````

</details>


https://github.com/llvm/llvm-project/pull/192848