[cfe-commits] [patch] Use raw_svector_ostream in more places in the mangler

[Rafael Ávila de Espíndola]

I wrote this while working on PR9177, but it is independent, so I am 
sending it first.

Most of the Mangle methods just create a raw_svector_ostream with the 
buffer that they get. This patch changes some of those methods to get a 
raw_svector_ostream directly. This avoids the creation of some temporary 
buffers.

Cheers,
Rafael

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