[cleanup][CSA] Regex cleanup load to use TNodified values

Matched:
  Load\(MachineType::(.*)\(\),
To:
  Load<$1T>(
for cases that were possible in CSA. Example:
Load(MachineType::Int32(), counter_address);
To:
Load<Int32T>(counter_address);

There are some cases that change a bit (e.g "Pointer" to "RawPtrT").

As a drive-by eliminate redundant UncheckedCasts.

Bug: v8:10021
Change-Id: I1135d5986ca7d1cd10ccdceb6c9b4c0aefedb685
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1977863Reviewed-by: Dan Elphick <delphick@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Auto-Submit: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65656}