[clang-format] Google Style: disable DerivePointerAlignment. (#149602) The [Google C++ Style Guide](https://google.github.io/styleguide/cppguide.html#Pointer_and_Reference_Expressions) is being changed to specify that spaces should go after the asterisk/ampersand, rather than permitting either before or after on a file-by-file basis. The new requirement is: > When referring to a pointer or reference (variable declarations or > definitions, arguments, return types, template parameters, etc.), > you must not place a space before the asterisk/ampersand. Use a > space to separate the type from the declared name (if present). The [Google ObjC style](https://google.github.io/styleguide/objcguide.html) is silent on this matter, but the de-facto style is not being modified at this time. So, keep DerivePointerAlignment enabled for ObjC language mode.
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