[clang-format] Add BreakBeforeTemplateCloser option (#118046)

In clang-format, multiline templates have the `>` on the same line as
the last parameter:

```c++
template <
    typename Foo,
    typename Bar>
void foo() {
```

I would like to add an option to put the `>` on the next line, like
this:

```c++
template <
    typename Foo,
    typename Bar
>
void foo() {
```

An example of a large project that uses this style is NVIDIA's CUTLASS,
here is an example:


https://github.com/NVIDIA/cutlass/blob/main/include/cutlass/epilogue/dispatch_policy.hpp#L149-L156

My reasoning is that it reminds me of this style of braces:

```c++
if (foo()) {
    bar();
    baz();}
```

Most people agree this is better:

```c++
if (foo()) {
    bar();
    baz();
}
```

---------

Co-authored-by: Owen Pan <owenpiano@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/clang/unittests/Format/ConfigParseTest.cpp b/clang/unittests/Format/ConfigParseTest.cpp
index 5bb1c00..0cb2a12 100644
--- a/clang/unittests/Format/ConfigParseTest.cpp
+++ b/clang/unittests/Format/ConfigParseTest.cpp
@@ -170,6 +170,7 @@ TEST(ConfigParseTest, ParsesConfigurationBools) {
   CHECK_PARSE_BOOL(BinPackArguments);
   CHECK_PARSE_BOOL(BreakAdjacentStringLiterals);
   CHECK_PARSE_BOOL(BreakAfterJavaFieldAnnotations);
+  CHECK_PARSE_BOOL(BreakBeforeTemplateCloser);
   CHECK_PARSE_BOOL(BreakBeforeTernaryOperators);
   CHECK_PARSE_BOOL(BreakStringLiterals);
   CHECK_PARSE_BOOL(CompactNamespaces);