[clang] [clang-format] Set Context.IsExpression for C++ ternary operators (PR #206300)

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


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/Format/TokenAnnotator.cpp clang/unittests/Format/FormatTest.cpp clang/unittests/Format/TokenAnnotatorTest.cpp --diff_from_common_commit
``````````

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The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
index cce77f5a8..1736bdc08 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -449,7 +449,7 @@ TEST_F(TokenAnnotatorTest, UnderstandsUsesOfStarAndAmp) {
   Tokens = annotate("foo ? a < b && c : bar");
   ASSERT_EQ(Tokens.size(), 10u) << Tokens;
   EXPECT_TOKEN(Tokens[5], tok::star, TT_BinaryOperator);
-  EXPECT_TOKEN(Tokens[6], tok::identifier, TT_Unknown);  // Not TT_StartOfName
+  EXPECT_TOKEN(Tokens[6], tok::identifier, TT_Unknown); // Not TT_StartOfName
 }
 
 TEST_F(TokenAnnotatorTest, UnderstandsUsesOfPlusAndMinus) {

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https://github.com/llvm/llvm-project/pull/206300