[WASM SIMD] Implement horizontal add for float and integer types.

src/arm/assembler-arm.h

Index: src/arm/assembler-arm.h
diff --git a/src/arm/assembler-arm.h b/src/arm/assembler-arm.h
index f16aee6e715d33b4f4d00760c76e116372fbf210..bc81f31729093de65556273654c4e65a625829ea 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -1371,6 +1371,9 @@ class Assembler : public AssemblerBase {
   void vmax(QwNeonRegister dst, QwNeonRegister src1, QwNeonRegister src2);
   void vmax(NeonDataType dt, QwNeonRegister dst,
             QwNeonRegister src1, QwNeonRegister src2);
+  void vpadd(DwVfpRegister dst, DwVfpRegister src1, DwVfpRegister src2);
+  void vpadd(NeonSize size, DwVfpRegister dst, DwVfpRegister src1,
+             DwVfpRegister src2);
   void vpmin(NeonDataType dt, DwVfpRegister dst, DwVfpRegister src1,
              DwVfpRegister src2);
   void vpmax(NeonDataType dt, DwVfpRegister dst, DwVfpRegister src1,