[clang] No spaces after colon and comma in initializer list (PR #190657)

[Björn Schäpers via cfe-commits]

================
@@ -5024,6 +5024,22 @@ struct FormatStyle {
   /// \version 3.5
   bool SpaceAfterCStyleCast;
 
+  /// If ``false``, spaces will be removed after constructor initializer colon.
+  /// \code
+  ///    true:                                  false:
+  ///    Foo::Foo() : a(a) {}                   Foo::Foo() :a(a) {}
----------------
HazardyKnusperkeks wrote:

```suggestion
  ///    Foo::Foo() : a(a) {}           vs.     Foo::Foo() :a(a) {}
```
same below.

https://github.com/llvm/llvm-project/pull/190657