[RISCV] Eagerly delete instructions in MergeBaseOffset.

The only iterator we're holding points to HiLUI and we never
delete that so I think it is safe to delete everything else
immediately.

I want to split detectAndFoldOffset into two phases. First, combine
LUI+ADDI with any ADD/ADDI/SHXADD that comes after it. This may
open opportunities to fold the ADDI from the LUI+ADDI into a
load/store address. So the load/store folding should run as a
second phase even if the ADD/ADDI/SHXADD made changes.

In order to do this we need to eagerly delete instructions in the
first phase so that we don't have dead users of the LUI+ADDI
when we start the second phase.

Patches to split the phases will come later.

Reviewed By: asb, luismarques

Differential Revision: https://reviews.llvm.org/D130119

0 files changed, 0 insertions, 0 deletions