[PATCH] clang-format: fix for \r\r\n produced in multiline block comments

[Christopher Olsen]

In multiline block comments \r\n line endings are replaced with
\r\r\n.  BreakableToken does not consider \r a "blank" character.  So,
internally it breaks lines on \n, leaving a dangling \r, then replaces
the \n with \r\n resulting in \r\r\n.

Attached is a fix which simply adds \r to the list of blank characters
in BreakableToken and includes a test case in SupportsCRLF.

Chris
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