PPC: [stubs] Split ToNumberStub into reusable subparts.

src/ppc/macro-assembler-ppc.cc

Index: src/ppc/macro-assembler-ppc.cc
diff --git a/src/ppc/macro-assembler-ppc.cc b/src/ppc/macro-assembler-ppc.cc
index 100ed2f328837674838aa5018ca0d1d7a71fcd3e..9d3c871e4deee49a00b45c4a42addbe3d1c691e6 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -2909,6 +2909,17 @@ void MacroAssembler::JumpIfEitherSmi(Register reg1, Register reg2,
   JumpIfSmi(reg2, on_either_smi);
 }
 
+void MacroAssembler::AssertNotNumber(Register object) {
+  if (emit_debug_code()) {
+    STATIC_ASSERT(kSmiTag == 0);
+    TestIfSmi(object, r0);
+    Check(ne, kOperandIsANumber, cr0);
+    push(object);
+    CompareObjectType(object, object, object, HEAP_NUMBER_TYPE);
+    pop(object);
+    Check(ne, kOperandIsANumber);
+  }
+}
 
 void MacroAssembler::AssertNotSmi(Register object) {
   if (emit_debug_code()) {