Revert "Clean up runtime functions for Maths."

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1371 matching lines @@
   // catch this corner-case, we bail out if the result was 0. (This can only
   // occur if the divisor is infinity or the base is zero.)
   __ Fcmp(result_double, 0.0);
   __ B(&done, ne);
 
   if (exponent_type_ == ON_STACK) {
     // Bail out to runtime code.
     __ Bind(&call_runtime);
     // Put the arguments back on the stack.
     __ Push(base_tagged, exponent_tagged);
-    __ TailCallRuntime(Runtime::kHiddenMathPow, 2, 1);
+    __ TailCallRuntime(Runtime::kMath_pow_cfunction, 2, 1);
 
     // Return.
     __ Bind(&done);
     __ AllocateHeapNumber(result_tagged, &call_runtime, scratch0, scratch1);
     __ Str(result_double,
         FieldMemOperand(result_tagged, HeapNumber::kValueOffset));
     ASSERT(result_tagged.is(x0));
     __ IncrementCounter(
         masm->isolate()->counters()->math_pow(), 1, scratch0, scratch1);
     __ Ret();
@@ skipping 4331 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64