[clang] [clang][AST] Pretty-print default template template args (PR #162134)

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


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You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/lib/AST/DeclPrinter.cpp clang/test/AST/ast-print-record-decl.c clang/unittests/AST/DeclPrinterTest.cpp
``````````

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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/AST/DeclPrinterTest.cpp b/clang/unittests/AST/DeclPrinterTest.cpp
index 2d415c46f..518d96ddf 100644
--- a/clang/unittests/AST/DeclPrinterTest.cpp
+++ b/clang/unittests/AST/DeclPrinterTest.cpp
@@ -1087,10 +1087,10 @@ TEST(DeclPrinter, TestClassTemplateDecl8) {
 
 TEST(DeclPrinter, TestClassTemplateDecl9) {
   ASSERT_TRUE(PrintedDeclCXX98Matches(
-    "template<typename T> struct Z { };"
-    "template<template<typename U> class T = Z> struct A { };",
-    classTemplateDecl(hasName("A")).bind("id"),
-    "template <template <typename U> class T = Z> struct A {}"));
+      "template<typename T> struct Z { };"
+      "template<template<typename U> class T = Z> struct A { };",
+      classTemplateDecl(hasName("A")).bind("id"),
+      "template <template <typename U> class T = Z> struct A {}"));
 }
 
 TEST(DeclPrinter, TestClassTemplateDecl10) {

``````````

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https://github.com/llvm/llvm-project/pull/162134