[CVP] Don't try to fold load/store operands to constant (#73338)

CVP currently tries to fold load/store pointer operands to constants
using LVI. If there is a dominating condition of the form `icmp eq ptr
%p, @g`, then `%p` will be replaced with `@g`.

LVI is geared towards range-based optimizations, and is *very*
inefficient at handling simple pointer equality conditions. We have
other passes that can handle this optimization in a more efficient way,
such as IPSCCP and GVN.

Removing this optimization gives a geomean 0.4-1.2% compile-time
improvement depending on configuration. At the same time, there
is no impact on codegen.

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