Merge #21221: [tools] Allow argument/parameter bin packing in clang-format

876ac3f [tools] Allow argument/parameter bin packing in clang-format (John Newbery)

Pull request description:

  clang-format documentation for BinPackArguments:

  If `false`, a function call’s arguments will either be all on the same line or will have one line each.

  ```
  true:
  void f() {
    f(aaaaaaaaaaaaaaaaaaaa, aaaaaaaaaaaaaaaaaaaa,
      aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa);
  }

  false:
  void f() {
    f(aaaaaaaaaaaaaaaaaaaa,
      aaaaaaaaaaaaaaaaaaaa,
      aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa);
  }
  ```

  https://clang.llvm.org/docs/ClangFormatStyleOptions.html#configurable-format-style-options

  There's no reason to forbid this format. Having multiple arguments or parameters per line can be just as readable as having one per line (and is certainly more readable than having extremely long lines).

ACKs for top commit:
  laanwj:
    ACK 876ac3f
  MarcoFalke:
    review ACK 876ac3f
  vasild:
    ACK 876ac3f

Tree-SHA512: 7c401b4551b458c83dd70883860788b4a60e08a5399171fef27a2f5fdc6b933f6454fe0d396c32d826e3ab537791329da3275ae9b5e9ad36630a6dc2c167e88f

Author: MarcoFalke

src/.clang-format

@@ -11,7 +11,8 @@ AllowShortIfStatementsOnASingleLine: true
 AllowShortLoopsOnASingleLine: false
 AlwaysBreakBeforeMultilineStrings: false
 AlwaysBreakTemplateDeclarations: true
-BinPackParameters: false
+BinPackArguments: true
+BinPackParameters: true
 BreakBeforeBinaryOperators: false
 BreakBeforeBraces: Custom
 BraceWrapping: