Revert "[ptr-compr][CSA] Enable the DecompressionOptimizer phase in CSA"

This reverts commit ad9bd3a0.

Reason for revert: Speculative revert for TSAN failures (https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20TSAN/28816)

Original change's description:
> [ptr-compr][CSA] Enable the DecompressionOptimizer phase in CSA
> 
> Also update the MachineGraphVerifier to take into account the
> possibility of the Store receiving a Compressed representation as well.
> 
> Bug: v8:7703
> Change-Id: I6d6e28b980151af6296000cfe6f67a3a037b029c
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1859627
> Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#64410}

TBR=jgruber@chromium.org,tebbi@chromium.org,solanes@chromium.org

Change-Id: I805593d9b49503a20348a4b059049ed24345cf8e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7703
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1871914Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64415}

src/compiler/machine-graph-verifier.cc

@@ -617,15 +617,7 @@ class MachineRepresentationChecker {
               case MachineRepresentation::kTagged:
               case MachineRepresentation::kTaggedPointer:
               case MachineRepresentation::kTaggedSigned:
-                if (COMPRESS_POINTERS_BOOL &&
-                    !FLAG_turbo_decompression_elimination &&
-                    node->opcode() == IrOpcode::kStore &&
-                    CanBeTaggedPointer(
-                        StoreRepresentationOf(node->op()).representation())) {
-                  CheckValueInputIsCompressedOrTagged(node, 2);
-                } else {
-                  CheckValueInputIsTagged(node, 2);
-                }
+                CheckValueInputIsTagged(node, 2);
                 break;
               case MachineRepresentation::kCompressed:
               case MachineRepresentation::kCompressedPointer:
@@ -807,27 +799,6 @@ class MachineRepresentationChecker {
     FATAL("%s", str.str().c_str());
   }
 
-  void CheckValueInputIsCompressedOrTagged(Node const* node, int index) {
-    Node const* input = node->InputAt(index);
-    switch (inferrer_->GetRepresentation(input)) {
-      case MachineRepresentation::kCompressed:
-      case MachineRepresentation::kCompressedPointer:
-      case MachineRepresentation::kCompressedSigned:
-      case MachineRepresentation::kTagged:
-      case MachineRepresentation::kTaggedPointer:
-      case MachineRepresentation::kTaggedSigned:
-        return;
-      default:
-        break;
-    }
-    std::ostringstream str;
-    str << "TypeError: node #" << node->id() << ":" << *node->op()
-        << " uses node #" << input->id() << ":" << *input->op()
-        << " which doesn't have a compressed or tagged representation.";
-    PrintDebugHelp(str, node);
-    FATAL("%s", str.str().c_str());
-  }
-
   void CheckValueInputIsTaggedOrPointer(Node const* node, int index) {
     Node const* input = node->InputAt(index);
     switch (inferrer_->GetRepresentation(input)) {

src/compiler/pipeline.cc

@@ -2571,10 +2571,6 @@ MaybeHandle<Code> Pipeline::GenerateCodeForCodeStub(
   pipeline.Run<CsaOptimizationPhase>();
   pipeline.RunPrintAndVerify(CsaOptimizationPhase::phase_name(), true);
 
-  pipeline.Run<DecompressionOptimizationPhase>();
-  pipeline.RunPrintAndVerify(DecompressionOptimizationPhase::phase_name(),
-                             true);
-
   pipeline.Run<VerifyGraphPhase>(true);
   pipeline.ComputeScheduledGraph();
   DCHECK_NOT_NULL(data.schedule());