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

R=mbrandy@us.ibm.com, svenpanne@chromium.org

BUG=

Review URL: https://codereview.chromium.org/1035723003

Cr-Commit-Position: refs/heads/master@{#27446}

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.

test/mjsunit/mjsunit.status

@@ -606,9 +606,5 @@
 
   # take too long with the simulator.
   'regress/regress-1132': [SKIP],
-
-  # these two issues started after uplevel, believe they share common cause
-  'debug-references': [SKIP],
-  'mirror-object': [SKIP],
 }],  # 'arch == ppc and simulator_run == True'
 ]