[clang] Add SuppressKeywordAttrs printing policy (PR #175398)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/include/clang/AST/PrettyPrinter.h clang/lib/AST/DeclPrinter.cpp clang/unittests/AST/DeclPrinterTest.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/unittests/AST/DeclPrinterTest.cpp b/clang/unittests/AST/DeclPrinterTest.cpp
index 82d1b89ad..b983a14fd 100644
--- a/clang/unittests/AST/DeclPrinterTest.cpp
+++ b/clang/unittests/AST/DeclPrinterTest.cpp
@@ -1575,8 +1575,8 @@ TEST(DeclPrinter, TestTemplateFinalWithPolishForDecl) {
 
 TEST(DeclPrinter, TestClassSuppressKeywordAttrs) {
   ASSERT_TRUE(PrintedDeclCXX11Matches(
-      "class alignas(32) A final {};",
-      cxxRecordDecl(hasName("A")).bind("id"), "class A {}",
+      "class alignas(32) A final {};", cxxRecordDecl(hasName("A")).bind("id"),
+      "class A {}",
       [](PrintingPolicy &Policy) { Policy.SuppressKeywordAttrs = true; }));
 }
 

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https://github.com/llvm/llvm-project/pull/175398