[ptr-compr][wasm] Replacing Tagged loads and stores with Compressed ones

This is a CL in a string that aims to replace the Tagged loads and stores
nodes that are still being created.

Also took the liberty of cleaning up part of wasm-compiler. There were some
cases where we could have been using the existing macros, but weren't.

Cq-Include-Trybots: luci.v8.try:v8_linux64_pointer_compression_rel_ng
Cq-Include-Trybots: luci.v8.try:v8_linux64_arm64_pointer_compression_rel_ng
Bug: v8:8977, v8:7703
Change-Id: Ic6ce2f9dc9f2ad440c91c98b1f449d3c76f42fd2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1591773Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61288}

src/compiler/wasm-compiler.h

@@ -222,6 +222,15 @@ class WasmGraphBuilder {
 
   void PatchInStackCheckIfNeeded();
 
+  // TODO(v8:8977, v8:7703): move this somewhere? This should be where it
+  // can be used in many places (e.g graph assembler, wasm compiler).
+  // Adds a decompression node if pointer compression is enabled and the type
+  // loaded is a compressed one. To be used after loads.
+  Node* InsertDecompressionIfNeeded(MachineType type, Node* value);
+  // Adds a compression node if pointer compression is enabled and the
+  // representation to be stored is a compressed one. To be used before stores.
+  Node* InsertCompressionIfNeeded(MachineRepresentation rep, Node* value);
+
   //-----------------------------------------------------------------------
   // Operations that read and/or write {control} and {effect}.
   //-----------------------------------------------------------------------