Clang-format breaks const identifier of const memeber function after argument comment

[llvmbot]

Bugzilla Link	46509
Version	unspecified
OS	All
Reporter	LLVM Bugzilla Contributor

Extended Description

The following snippet was formatted with clang-format which came along clang 5.0

virtual Composite *copy_composite_tree(Composite *parent  // parent of copied tree
                                      ) const;

We updated to clang 10.0 and now the format changes to

virtual Composite *copy_composite_tree(Composite *parent  // parent of copied tree
) const;

The const qualifier is broken onto the next line.

This holds for all build in styles (LLVM, Google, ...).
WINDOWS 10 and Rehat 6 both give the same result.
The above snippet is just an example. It holds for all such occurrences in our code base.

[llvmbot]

clang-format which came along clang 8.0.1 is working fine
clang-format which came along clang 9.0.1 is working already brocken.