Incorrect formatting for arguments following postfix #if

[hamishknight]

For e.g:

print(
    ""
    #if true
        .count
    #endif
    , 0
)

swift-format produces:

print(
  ""
    #if true
      .count
    #endif, 0
)

which the compiler rejects since the comma may not appear on the same line as the #endif.

rdar://124557891

[davidgreenaway]

For anyone affected, a workaround is to add end empty comment at the end of the #endif line, as follows:

print(
  ""
    #if true
      .count
    #endif //
    , 0
)

This will prevent swift-format from joining the lines together (and hence causing the file to no longer compile).