[Bug ld/26766] Support standalone PGO build

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26766

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Martin Liska from comment #1)
> I appreciate the effort H.J.
> 
> There are some comments:
> 
> 1) make config
> make config
> make: Nothing to be done for '../config'.
> 
> 2) I don't see what accepts the PGO-CFLAGS? I can't find it in any Makefile
> or so
> 
> 3) Why do you need the install step in between training and -fprofile-use
> run?

Please take a look at users/hjl/pgo-lto branch

https://gitlab.com/x86-binutils/binutils-gdb/-/commits/users/hjl/pgo-lto

If check-binutils check-gas check-ld training is good enough, I can drop
"make install" and "make check" steps.

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