S390 [wasm-simd]: prototype i64x2 widen i32x4

Bug: v8:10972
Change-Id: Id7b17ad54f0a6a1a8b3eb04bb81b2ec94bca921b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2635796Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72154}

src/compiler/backend/s390/code-generator-s390.cc

@@ -3702,6 +3702,22 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
 #define VECTOR_UNPACK(op, mode)                                             \
   __ op(i.OutputSimd128Register(), i.InputSimd128Register(0), Condition(0), \
         Condition(0), Condition(mode));
+    case kS390_I64x2SConvertI32x4Low: {
+      VECTOR_UNPACK(vupl, 2)
+      break;
+    }
+    case kS390_I64x2SConvertI32x4High: {
+      VECTOR_UNPACK(vuph, 2)
+      break;
+    }
+    case kS390_I64x2UConvertI32x4Low: {
+      VECTOR_UNPACK(vupll, 2)
+      break;
+    }
+    case kS390_I64x2UConvertI32x4High: {
+      VECTOR_UNPACK(vuplh, 2)
+      break;
+    }
     case kS390_I32x4SConvertI16x8Low: {
       VECTOR_UNPACK(vupl, 1)
       break;

src/compiler/backend/s390/instruction-codes-s390.h

@@ -259,6 +259,10 @@ namespace compiler {
   V(S390_I64x2ExtMulHighI32x4S)             \
   V(S390_I64x2ExtMulLowI32x4U)              \
   V(S390_I64x2ExtMulHighI32x4U)             \
+  V(S390_I64x2SConvertI32x4Low)             \
+  V(S390_I64x2SConvertI32x4High)            \
+  V(S390_I64x2UConvertI32x4Low)             \
+  V(S390_I64x2UConvertI32x4High)            \
   V(S390_I32x4Splat)                        \
   V(S390_I32x4ExtractLane)                  \
   V(S390_I32x4ReplaceLane)                  \

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

@@ -206,6 +206,10 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kS390_I64x2ExtMulHighI32x4S:
     case kS390_I64x2ExtMulLowI32x4U:
     case kS390_I64x2ExtMulHighI32x4U:
+    case kS390_I64x2SConvertI32x4Low:
+    case kS390_I64x2SConvertI32x4High:
+    case kS390_I64x2UConvertI32x4Low:
+    case kS390_I64x2UConvertI32x4High:
     case kS390_I32x4Splat:
     case kS390_I32x4ExtractLane:
     case kS390_I32x4ReplaceLane: