[turbofan] Remove the no-context hack for JSToNumber.

src/arm64/code-stubs-arm64.cc

Index: src/arm64/code-stubs-arm64.cc
diff --git a/src/arm64/code-stubs-arm64.cc b/src/arm64/code-stubs-arm64.cc
index 6392640741ba3513f025927b0365e5abd0d50bfe..e773b531a1e2784ca34a05626728621c5fd4adc2 100644
--- a/src/arm64/code-stubs-arm64.cc
+++ b/src/arm64/code-stubs-arm64.cc
@@ -3887,16 +3887,43 @@ void SubStringStub::Generate(MacroAssembler* masm) {
 
 void ToNumberStub::Generate(MacroAssembler* masm) {
   // The ToNumber stub takes one argument in x0.
-  Label check_heap_number, call_builtin;
-  __ JumpIfNotSmi(x0, &check_heap_number);
+  Label not_smi;
+  __ JumpIfNotSmi(x0, &not_smi);
   __ Ret();
-
-  __ bind(&check_heap_number);
-  __ JumpIfNotHeapNumber(x0, &call_builtin);
+  __ Bind(&not_smi);
+
+  Label not_heap_number;
+  __ Ldr(x1, FieldMemOperand(x0, HeapObject::kMapOffset));
+  __ Ldrb(x1, FieldMemOperand(x1, Map::kInstanceTypeOffset));
+  // x0: object
+  // x1: instance type
+  __ Cmp(x1, HEAP_NUMBER_TYPE);
+  __ B(ne, &not_heap_number);
+  __ Ret();
+  __ Bind(&not_heap_number);
+
+  Label not_string, slow_string;
+  __ Cmp(x1, FIRST_NONSTRING_TYPE);
+  __ B(hs, &not_string);
+  // Check if string has a cached array index.
+  __ Ldr(x2, FieldMemOperand(x0, String::kHashFieldOffset));
+  __ Tst(x2, Operand(String::kContainsCachedArrayIndexMask));
+  __ B(ne, &slow_string);
+  __ IndexFromHash(x2, x0);
+  __ Ret();
+  __ Bind(&slow_string);
+  __ Push(x0);  // Push argument.
+  __ TailCallRuntime(Runtime::kStringToNumber, 1, 1);
+  __ Bind(&not_string);
+
+  Label not_oddball;
+  __ Cmp(x1, ODDBALL_TYPE);
+  __ B(ne, &not_oddball);
+  __ Ldr(x0, FieldMemOperand(x0, Oddball::kToNumberOffset));
   __ Ret();
+  __ Bind(&not_oddball);
 
-  __ bind(&call_builtin);
-  __ push(x0);
+  __ Push(x0);  // Push argument.
   __ InvokeBuiltin(Builtins::TO_NUMBER, JUMP_FUNCTION);
 }