[issue44340] Add support for building cpython with clang thin lto

[Dong-hee Na]

Dong-hee Na <donghee.na at python.org> added the comment:

FYI, Thin LTO shows enhanced build time.


Full LTO (./configure --with-lto=full CC=clang)
real	2m33.740s
user	8m25.695s
sys	0m13.124s

Thin LTO (./configure --with-lto=thin CC=clang)
real	1m51.867s
user	12m53.694s
sys	0m12.786s

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<https://bugs.python.org/issue44340>
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