[Clang-format] arithmetic expressions involving braces are misformatted as pointers/references

[kadircet]

expected formatting:

auto x = Foo{1} * Foo{2};
auto x = 1 * Foo{2};
auto x = bar * Foo{2};

actual formatting:

auto x = Foo{1} *Foo{2};
auto x = 1 *Foo{2};
auto x = bar *Foo{2};

[llvmbot]

@llvm/issue-subscribers-c-1

Author: kadir çetinkaya (kadircet)

expected formatting: ```cpp auto x = Foo{1} * Foo{2}; auto x = 1 * Foo{2}; auto x = bar * Foo{2}; ```

actual formatting:

auto x = Foo{1} *Foo{2};
auto x = 1 *Foo{2};
auto x = bar *Foo{2};

[llvmbot]

@llvm/issue-subscribers-clang-format

Author: kadir çetinkaya (kadircet)

expected formatting: ```cpp auto x = Foo{1} * Foo{2}; auto x = 1 * Foo{2}; auto x = bar * Foo{2}; ```

actual formatting:

auto x = Foo{1} *Foo{2};
auto x = 1 *Foo{2};
auto x = bar *Foo{2};

[kadircet]

culprit seems to be 98281da cc @owenca

I believe this is due to unconditionally marking any */& before a brace as pointer.