Linker: no demangle.

You can c++filt, but you can't c++unfilt.

By having the linker provide the exact name of symbols
that are used, we can much more easily resolve missing
symbols in version script files. For instance, I spent
2 hours today working around not having this... :(

After a while, you get used to it. I don't even see the
code.

Bug: 206145174
Test: hide all symbols from a library and see beautiful
  and lossless raw symbols.
Change-Id: Ie0730cd503358bf2d383a56be902f7aeef1eea01