Revert "[AArch64][GlobalISel] Fold constants into G_GLOBAL_VALUE"

This reverts commit 61b4702a408834228c1c139b0e9af98616774db4.

We were seeing some test failures in SPECINT2006 due to this change. Reverting
to investigate.

GitOrigin-RevId: 962b73dd0fc3906980e597f72a35eee7121cc5e2
12 files changed