PPC: [builtins] Make Math.max and Math.min fast by default.

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 624f94b3dc4dcebcbd7b0c8fa66b04c159f8c5d7..a2043a0559623af9572e48d90a76d2dadfe568e1 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -183,6 +183,10 @@ void MacroAssembler::Drop(int count) {
   }
 }
 
+void MacroAssembler::Drop(Register count, Register scratch) {
+  ShiftLeftImm(scratch, count, Operand(kPointerSizeLog2));
+  add(sp, sp, scratch);
+}
 
 void MacroAssembler::Call(Label* target) { b(target, SetLK); }