Revert r38116 because of crashes.

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
===================================================================
--- runtime/vm/intermediate_language_mips.cc	(revision 38117)
+++ runtime/vm/intermediate_language_mips.cc	(working copy)
@@ -4284,16 +4284,12 @@
 LocationSummary* CheckClassInstr::MakeLocationSummary(Isolate* isolate,
                                                       bool opt) const {
   const intptr_t kNumInputs = 1;
-  const bool need_mask_temp = IsDenseSwitch() && !IsDenseMask(ComputeCidMask());
-  const intptr_t kNumTemps = !IsNullCheck() ? (need_mask_temp ? 2 : 1) : 0;
+  const intptr_t kNumTemps = !IsNullCheck() ? 1 : 0;
   LocationSummary* summary = new(isolate) LocationSummary(
       isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   if (!IsNullCheck()) {
     summary->set_temp(0, Location::RequiresRegister());
-    if (need_mask_temp) {
-      summary->set_temp(1, Location::RequiresRegister());
-    }
   }
   return summary;
 }
@@ -4325,36 +4321,16 @@
     __ beq(CMPRES1, ZR, deopt);
   }
   __ LoadClassId(temp, value);
-
-  if (IsDenseSwitch()) {
-    ASSERT(cids_[0] < cids_[cids_.length() - 1]);
-    __ LoadImmediate(TMP, cids_[0]);
-    __ subu(temp, temp, TMP);
-    __ LoadImmediate(TMP, cids_[cids_.length() - 1] - cids_[0]);
-    __ BranchUnsignedGreater(temp, TMP, deopt);
-
-    intptr_t mask = ComputeCidMask();
-    if (!IsDenseMask(mask)) {
-      // Only need mask if there are missing numbers in the range.
-      ASSERT(cids_.length() > 2);
-      Register mask_reg = locs()->temp(1).reg();
-      __ LoadImmediate(mask_reg, 1);
-      __ sllv(mask_reg, mask_reg, temp);
-      __ AndImmediate(mask_reg, mask_reg, mask);
-      __ beq(mask_reg, ZR, deopt);
+  const intptr_t num_checks = unary_checks().NumberOfChecks();
+  for (intptr_t i = cix; i < num_checks; i++) {
+    ASSERT(unary_checks().GetReceiverClassIdAt(i) != kSmiCid);
+    __ LoadImmediate(TMP, unary_checks().GetReceiverClassIdAt(i));
+    __ subu(CMPRES1, temp, TMP);
+    if (i == (num_checks - 1)) {
+      __ bne(CMPRES1, ZR, deopt);
+    } else {
+      __ beq(CMPRES1, ZR, &is_ok);
     }
-  } else {
-    const intptr_t num_checks = unary_checks().NumberOfChecks();
-    for (intptr_t i = cix; i < num_checks; i++) {
-      ASSERT(unary_checks().GetReceiverClassIdAt(i) != kSmiCid);
-      __ LoadImmediate(TMP, unary_checks().GetReceiverClassIdAt(i));
-      __ subu(CMPRES1, temp, TMP);
-      if (i == (num_checks - 1)) {
-        __ bne(CMPRES1, ZR, deopt);
-      } else {
-        __ beq(CMPRES1, ZR, &is_ok);
-      }
-    }
   }
   __ Bind(&is_ok);
 }
@@ -4380,34 +4356,6 @@
 }
 
 
-LocationSummary* CheckClassIdInstr::MakeLocationSummary(Isolate* isolate,
-                                                        bool opt) const {
-  const intptr_t kNumInputs = 2;
-  const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
-  summary->set_in(0, Location::RequiresRegister());
-  summary->set_in(1, Location::RegisterOrSmiConstant(right()));
-  return summary;
-}
-
-
-void CheckClassIdInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  Register left = locs()->in(0).reg();
-  Location right = locs()->in(1);
-  Label* deopt = compiler->AddDeoptStub(deopt_id(), ICData::kDeoptCheckClass);
-  if (right.IsRegister()) {
-    __ bne(left, right.reg(), deopt);
-  } else {
-    ASSERT(right.IsConstant());
-    const Object& right_const = Smi::Cast(right.constant());
-    __ BranchNotEqual(left,
-                      reinterpret_cast<int32_t>(right_const.raw()),
-                      deopt);
-  }
-}
-
-
 LocationSummary* CheckArrayBoundInstr::MakeLocationSummary(Isolate* isolate,
                                                            bool opt) const {
   const intptr_t kNumInputs = 2;