Turbofan: Modify WASM linkage to store floats using only 4 bytes.

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 8f014747ff52a452a75cb4fd84df49014b22d3c6..eb7eb0cb99a3f15dfe927564db0602a1def2882e 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -1320,6 +1320,10 @@ class Assembler : public AssemblerBase {
     vstm(db_w, sp, src, src, cond);
   }
 
+  void vpush(SwVfpRegister src, Condition cond = al) {
+    vstm(db_w, sp, src, src, cond);
+  }
+
   void vpop(DwVfpRegister dst, Condition cond = al) {
     vldm(ia_w, sp, dst, dst, cond);
   }