A64: Handle Smi representation in MathAbs and fix MathPowStub

src/a64/code-stubs-a64.cc

Index: src/a64/code-stubs-a64.cc
diff --git a/src/a64/code-stubs-a64.cc b/src/a64/code-stubs-a64.cc
index 81f4a5657d19c5db35cbb2588c0467330168036d..fdad07476649e94a5566af1477e2fca9ded9274b 100644
--- a/src/a64/code-stubs-a64.cc
+++ b/src/a64/code-stubs-a64.cc
@@ -2216,14 +2216,15 @@ void MathPowStub::Generate(MacroAssembler* masm) {
       __ Mov(lr, saved_lr);
       __ B(&done);
     }
+
+    // Handle SMI exponents.
+    __ Bind(&exponent_is_smi);
+    //  x10   base_tagged       The tagged base (input).
+    //  x11   exponent_tagged   The tagged exponent (input).
+    //  d1    base_double       The base as a double.
+    __ SmiUntag(exponent_integer, exponent_tagged);
   }
 
-  // Handle integer (and SMI) exponents.
-  __ Bind(&exponent_is_smi);
-  //  x10   base_tagged       The tagged base (input).
-  //  x11   exponent_tagged   The tagged exponent (input).
-  //  d1    base_double       The base as a double.
-  __ SmiUntag(exponent_integer, exponent_tagged);
   __ Bind(&exponent_is_integer);
   //  x10   base_tagged       The tagged base (input).
   //  x11   exponent_tagged   The tagged exponent (input).