clang-format: Allow unbroken ::: in inline assembly

[Eugene Toder]

Hello,

When inline assembly has only clobber constraints it's common to write all
three colons without spaces, for example:

asm volatile("nop" ::: "memory");

Currently clang-format splits ::: into coloncolon and colon, and inserts a
space before the colon, which looks strange:

asm volatile("nop" :: : "memory");

I suggest to allow having ::: without spaces in this case. Attached is a
simple patch to that effect.

Thanks,
Eugene
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