Revert of [ic] [stubs] Don't use Code::flags in megamorphic stub cache hash computations.

src/ic/s390/stub-cache-s390.cc

Index: src/ic/s390/stub-cache-s390.cc
diff --git a/src/ic/s390/stub-cache-s390.cc b/src/ic/s390/stub-cache-s390.cc
index 66fd70f43ac294e7a7c78ae08cc21047df437fbb..69afc25624afc6d19a1186e44102d0ee9c1574e9 100644
--- a/src/ic/s390/stub-cache-s390.cc
+++ b/src/ic/s390/stub-cache-s390.cc
@@ -15,7 +15,8 @@
 #define __ ACCESS_MASM(masm)
 
 static void ProbeTable(StubCache* stub_cache, MacroAssembler* masm,
-                       StubCache::Table table, Register receiver, Register name,
+                       Code::Flags flags, StubCache::Table table,
+                       Register receiver, Register name,
                        // Number of the cache entry, not scaled.
                        Register offset, Register scratch, Register scratch2,
                        Register offset_scratch) {
@@ -69,10 +70,7 @@
   scratch2 = no_reg;
   __ LoadP(code, MemOperand(base_addr, value_off_addr - key_off_addr));
 
-#ifdef DEBUG
   // Check that the flags match what we're looking for.
-  Code::Flags flags = Code::RemoveHolderFromFlags(
-      Code::ComputeHandlerFlags(stub_cache->ic_kind()));
   Register flags_reg = base_addr;
   base_addr = no_reg;
   __ LoadlW(flags_reg, FieldMemOperand(code, Code::kFlagsOffset));
@@ -80,8 +78,9 @@
   DCHECK(!r0.is(flags_reg));
   __ AndP(flags_reg, flags_reg, Operand(~Code::kFlagsNotUsedInLookup));
   __ CmpLogicalP(flags_reg, Operand(flags));
-  __ Check(eq, kUnexpectedValue);
+  __ bne(&miss, Label::kNear);
 
+#ifdef DEBUG
   if (FLAG_test_secondary_stub_cache && table == StubCache::kPrimary) {
     __ b(&miss, Label::kNear);
   } else if (FLAG_test_primary_stub_cache && table == StubCache::kSecondary) {
@@ -101,6 +100,9 @@
 void StubCache::GenerateProbe(MacroAssembler* masm, Register receiver,
                               Register name, Register scratch, Register extra,
                               Register extra2, Register extra3) {
+  Code::Flags flags =
+      Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(ic_kind_));
+
   Label miss;
 
 #if V8_TARGET_ARCH_S390X
@@ -151,22 +153,24 @@
   __ LoadlW(scratch, FieldMemOperand(name, Name::kHashFieldOffset));
   __ LoadP(ip, FieldMemOperand(receiver, HeapObject::kMapOffset));
   __ AddP(scratch, scratch, ip);
+  __ XorP(scratch, scratch, Operand(flags));
   // The mask omits the last two bits because they are not part of the hash.
   __ AndP(scratch, scratch,
           Operand((kPrimaryTableSize - 1) << kCacheIndexShift));
 
   // Probe the primary table.
-  ProbeTable(this, masm, kPrimary, receiver, name, scratch, extra, extra2,
-             extra3);
+  ProbeTable(this, masm, flags, kPrimary, receiver, name, scratch, extra,
+             extra2, extra3);
 
   // Primary miss: Compute hash for secondary probe.
   __ SubP(scratch, scratch, name);
+  __ AddP(scratch, scratch, Operand(flags));
   __ AndP(scratch, scratch,
           Operand((kSecondaryTableSize - 1) << kCacheIndexShift));
 
   // Probe the secondary table.
-  ProbeTable(this, masm, kSecondary, receiver, name, scratch, extra, extra2,
-             extra3);
+  ProbeTable(this, masm, flags, kSecondary, receiver, name, scratch, extra,
+             extra2, extra3);
 
   // Cache miss: Fall-through and let caller handle the miss by
   // entering the runtime system.