[wasm] Implementation of Word32PairShr and Word32PairSar on arm.

src/compiler/arm/code-generator-arm.cc

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index 9ae10ca3f868c2834acf399b8794640665f9c356..0f81caecb8c86033af233ddbe85a46714c476747 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -807,6 +807,24 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
                    i.InputRegister(1), kScratchReg, i.InputRegister(2));
       }
       break;
+    case kArmLsrPair:
+      if (instr->InputAt(2)->IsImmediate()) {
+        __ LsrPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+                   i.InputRegister(1), i.InputInt32(2));
+      } else {
+        __ LsrPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+                   i.InputRegister(1), kScratchReg, i.InputRegister(2));
+      }
+      break;
+    case kArmAsrPair:
+      if (instr->InputAt(2)->IsImmediate()) {
+        __ AsrPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+                   i.InputRegister(1), i.InputInt32(2));
+      } else {
+        __ AsrPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+                   i.InputRegister(1), kScratchReg, i.InputRegister(2));
+      }
+      break;
     case kArmVcmpF32:
       if (instr->InputAt(1)->IsDoubleRegister()) {
         __ VFPCompareAndSetFlags(i.InputFloat32Register(0),