[patch] Drop support for mangling unnamed globals

[Rafael Espíndola]

HI Chris,

This feature apparently exists to make it easier for frontends to
create auxiliary functions and variables without worrying about their
names. It has quiet a bit of history, I tried to find when it was
introduced, but it is older than the current mangler. It already
existed back when % and @ were one :-)

Given that LLVM will rename a global if the name is already used, it
is easy for a frontend to create auxiliary globals that are already
unique at the llvm level, so the mangler/codegen features seems a bit
redundant.

This is not a critical patch, just a possible cleanup I noticed when
moving the Mangler. It does remove a DenseMap, making the Mangler a
bit lighter.

Cheers,
Rafael
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