PPC: Ensure predictable code size at map_check in LCodeGen::DoInstanceOfKnownGlobal.

src/ppc/lithium-codegen-ppc.cc

Index: src/ppc/lithium-codegen-ppc.cc
diff --git a/src/ppc/lithium-codegen-ppc.cc b/src/ppc/lithium-codegen-ppc.cc
index 207075534c32ce0e32851eb5a1b3708ed9157f29..f6147c2196eef20480bbcc2ab3bc485b0603d751 100644
--- a/src/ppc/lithium-codegen-ppc.cc
+++ b/src/ppc/lithium-codegen-ppc.cc
@@ -2885,7 +2885,7 @@ void LCodeGen::DoInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr) {
   Register map = temp;
   __ LoadP(map, FieldMemOperand(object, HeapObject::kMapOffset));
   {
-    // Block constant pool emission to ensure the positions of instructions are
+    // Block trampoline emission to ensure the positions of instructions are
     // as expected by the patcher. See InstanceofStub::Generate().
     Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm_);
     __ bind(deferred->map_check());  // Label for calculating code patching.
@@ -2896,7 +2896,7 @@ void LCodeGen::DoInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr) {
     __ mov(ip, Operand(cell));
     __ LoadP(ip, FieldMemOperand(ip, Cell::kValueOffset));
     __ cmp(map, ip);
-    __ bne(&cache_miss);
+    __ bc_short(ne, &cache_miss);
     // We use Factory::the_hole_value() on purpose instead of loading from the
     // root array to force relocation to be able to later patch
     // with true or false.