[Bug ld/26766] Support standalone PGO build

[hjl.tools at gmail dot com]

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

--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> ---
With GCC 11

commit 4f8cfb42883cc247f11096a3703e379d1f24ab3f
Author: Jan Hubicka <jh@suse.cz>
Date:   Mon Oct 26 20:19:33 2020 +0100

    Extend builtin fnspecs

I got 

FAIL: nm --line-numbers on DWARF-4 debug info (grep for externd global
file/line)
FAIL: build-id-debuglink (grepping for source file name in disassembly output)
FAIL: objdump -S
FAIL: objdump --source-comment
FAIL: DWARF parse during linker error
FAIL: Build warn libbar.so
FAIL: Run warn with versioned libfoo.so
FAIL: undefined symbol with compressed debug sections
FAIL: PR ld/12760
FAIL: plugin claimfile lost symbol
FAIL: plugin claimfile replace symbol
FAIL: plugin claimfile resolve symbol
FAIL: plugin claimfile lost symbol with source
FAIL: plugin claimfile replace symbol with source
FAIL: plugin claimfile resolve symbol with source
FAIL: plugin 2 with source lib
FAIL: load plugin 2 with source
FAIL: plugin 3 with source lib
FAIL: load plugin 3 with source
FAIL: undefined line
FAIL: undefined line
FAIL: undefined symbol with compressed debug sections

with

--enable-pgo-build=lto --disable-werror

It looks binutils is miscompiled by GCC 11.

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