[X86] Set SHF_X86_64_LARGE for globals with explicit well-known large section name (#74381)

Globals marked with the .lbss/.ldata/.lrodata should automatically be
treated as large.
Do this regardless of the code model for consistency when mixing object
files compiled with different code models.

Basically the other half of #70748.

Example in the wild:
https://codebrowser.dev/qt5/qtbase/src/testlib/qtestcase.cpp.html#1664