PPC: [turbofan] Further fixing ES6 tail call elimination in Turbofan.

src/compiler/ppc/instruction-selector-ppc.cc

Index: src/compiler/ppc/instruction-selector-ppc.cc
diff --git a/src/compiler/ppc/instruction-selector-ppc.cc b/src/compiler/ppc/instruction-selector-ppc.cc
index e89506262489db0fa0565240426396571f22d73a..bedc102e9523920f30746fbbcc8f8e4a05452d3b 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -1775,6 +1775,7 @@ void InstructionSelector::EmitPrepareArguments(
 
 bool InstructionSelector::IsTailCallAddressImmediate() { return false; }
 
+int InstructionSelector::GetTempsCountForTailCallFromJSFunction() { return 3; }
 
 void InstructionSelector::VisitFloat64ExtractLowWord32(Node* node) {
   PPCOperandGenerator g(this);