PPC/s390: [wasm-simd] Implement i64x2 add sub for arm

Port ea06b01e

Original Commit Message:

    Also some cleanup reordering of instruction codes.

R=zhin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I9e299c6c226d4fedf33bbaeba6242771d4947816
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1929073Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#65099}

src/compiler/backend/ppc/instruction-selector-ppc.cc

@@ -2424,6 +2424,10 @@ void InstructionSelector::VisitF64x2Le(Node* node) { UNIMPLEMENTED(); }
 
 void InstructionSelector::VisitI64x2Neg(Node* node) { UNIMPLEMENTED(); }
 
+void InstructionSelector::VisitI64x2Add(Node* node) { UNIMPLEMENTED(); }
+
+void InstructionSelector::VisitI64x2Sub(Node* node) { UNIMPLEMENTED(); }
+
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {

src/compiler/backend/s390/instruction-selector-s390.cc

@@ -2839,6 +2839,10 @@ void InstructionSelector::VisitF64x2Le(Node* node) { UNIMPLEMENTED(); }
 
 void InstructionSelector::VisitI64x2Neg(Node* node) { UNIMPLEMENTED(); }
 
+void InstructionSelector::VisitI64x2Add(Node* node) { UNIMPLEMENTED(); }
+
+void InstructionSelector::VisitI64x2Sub(Node* node) { UNIMPLEMENTED(); }
+
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {