[arm, arm64] Implemented unaligned scalar float access.

runtime/vm/assembler_arm64.h

Index: runtime/vm/assembler_arm64.h
diff --git a/runtime/vm/assembler_arm64.h b/runtime/vm/assembler_arm64.h
index cde10dac4e529ea577cac9b1a6445a1bed009b64..cbeadfd80e1fa3b669cfd6ffb2fafefb6e0dbbf9 100644
--- a/runtime/vm/assembler_arm64.h
+++ b/runtime/vm/assembler_arm64.h
@@ -843,6 +843,18 @@ class Assembler : public ValueObject {
     EmitFPImm(FMOVDI, vd, imm8);
     return true;
   }
+  void fmovsr(VRegister vd, Register rn) {
+    ASSERT(rn != R31);
+    ASSERT(rn != CSP);
+    const Register crn = ConcreteRegister(rn);
+    EmitFPIntCvtOp(FMOVSR, static_cast<Register>(vd), crn, kWord);
+  }
+  void fmovrs(Register rd, VRegister vn) {
+    ASSERT(rd != R31);
+    ASSERT(rd != CSP);
+    const Register crd = ConcreteRegister(rd);
+    EmitFPIntCvtOp(FMOVRS, crd, static_cast<Register>(vn), kWord);
+  }
   void fmovdr(VRegister vd, Register rn) {
     ASSERT(rn != R31);
     ASSERT(rn != CSP);