PPC: [runtime] Replace COMPARE/COMPARE_STRONG with proper Object::Compare.

src/ppc/code-stubs-ppc.cc

Index: src/ppc/code-stubs-ppc.cc
diff --git a/src/ppc/code-stubs-ppc.cc b/src/ppc/code-stubs-ppc.cc
index 2233961da96a3c852ef6eccfc071e471b8ec9cb9..5eaa2a71eb1e5fc589bb7fb3a848529d9630c79d 100644
--- a/src/ppc/code-stubs-ppc.cc
+++ b/src/ppc/code-stubs-ppc.cc
@@ -711,9 +711,6 @@ void CompareICStub::GenerateGeneric(MacroAssembler* masm) {
     __ TailCallRuntime(strict() ? Runtime::kStrictEquals : Runtime::kEquals, 2,
                        1);
   } else {
-    int context_index = is_strong(strength())
-                            ? Context::COMPARE_STRONG_BUILTIN_INDEX
-                            : Context::COMPARE_BUILTIN_INDEX;
     int ncr;  // NaN compare result
     if (cc == lt || cc == le) {
       ncr = GREATER;
@@ -726,7 +723,9 @@ void CompareICStub::GenerateGeneric(MacroAssembler* masm) {
 
     // Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
     // tagged as a small integer.
-    __ InvokeBuiltin(context_index, JUMP_FUNCTION);
+    __ TailCallRuntime(
+        is_strong(strength()) ? Runtime::kCompare_Strong : Runtime::kCompare, 3,
+        1);
   }
 
   __ bind(&miss);