[clang] [CIR] Add support for ternary operator as lvalue (PR #163580)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/lib/CIR/CodeGen/CIRGenExpr.cpp clang/lib/CIR/CodeGen/CIRGenFunction.cpp clang/lib/CIR/CodeGen/CIRGenFunction.h clang/lib/CIR/Dialect/IR/CIRDialect.cpp clang/lib/CIR/Dialect/Transforms/FlattenCFG.cpp clang/test/CIR/CodeGen/opaque.cpp clang/test/CIR/CodeGen/ternary.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CIR/Dialect/IR/CIRDialect.cpp b/clang/lib/CIR/Dialect/IR/CIRDialect.cpp
index 7223bc066..b5975442f 100644
--- a/clang/lib/CIR/Dialect/IR/CIRDialect.cpp
+++ b/clang/lib/CIR/Dialect/IR/CIRDialect.cpp
@@ -1955,7 +1955,7 @@ void cir::TernaryOp::build(
   YieldOp yield = dyn_cast_or_null<YieldOp>(trueRegion->back().getTerminator());
   if (!yield)
     yield = dyn_cast_or_null<YieldOp>(falseRegion->back().getTerminator());
-  
+
   assert((yield && yield.getNumOperands() <= 1) &&
          "expected zero or one result type");
   if (yield.getNumOperands() == 1)

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https://github.com/llvm/llvm-project/pull/163580