[PATCH] Add .gnu.lto_.meta section.

[Martin Liška]

Hi.

The patch is about a new ELF section that will contain information
about LTO version. And for the future, used compression will be stored
here. The patch removes streaming of the version into each section.

Disadvantage is a format change that will lead to following errors when
LTO bytecode is used from a different version:

$ gcc x.o
lto1: fatal error: bytecode stream in file ‘x.o’ generated with GCC compiler older than 10.0

$ gcc-9 main.o
lto1: fatal error: bytecode stream in file ‘main.o’ generated with LTO version 850.0 instead of the expected 8.0

I've been testing the patch.
Thoughts?
Martin
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