Ensure that we do not accidentally emit debug code.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index da17e297637f01656e5f7708be1aebf376ff2bfb..296fa324bedb1e077a3a50a2eadcb28c9936ee13 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -2109,7 +2109,7 @@ void LCodeGen::DoGetCachedArrayIndex(LGetCachedArrayIndex* instr) {
   Register input = ToRegister(instr->value());
   Register result = ToRegister(instr->result());
 
-  __ AbortIfNotString(input);
+  __ AssertString(input);
 
   __ mov(result, FieldOperand(input, String::kHashFieldOffset));
   __ IndexFromHash(result, result);
@@ -4045,9 +4045,7 @@ void LCodeGen::DoDeferredStringCharCodeAt(LStringCharCodeAt* instr) {
   }
   CallRuntimeFromDeferred(Runtime::kStringCharCodeAt, 2,
                           instr, instr->context());
-  if (FLAG_debug_code) {
-    __ AbortIfNotSmi(eax);
-  }
+  __ AssertSmi(eax);
   __ SmiUntag(eax);
   __ StoreToSafepointRegisterSlot(result, eax);
 }
@@ -4301,9 +4299,7 @@ void LCodeGen::DoSmiUntag(LSmiUntag* instr) {
     __ test(ToRegister(input), Immediate(kSmiTagMask));
     DeoptimizeIf(not_zero, instr->environment());
   } else {
-    if (FLAG_debug_code) {
-      __ AbortIfNotSmi(ToRegister(input));
-    }
+    __ AssertSmi(ToRegister(input));
   }
   __ SmiUntag(ToRegister(input));
 }
@@ -4836,7 +4832,7 @@ void LCodeGen::DoAllocateObject(LAllocateObject* instr) {
   __ mov(map, FieldOperand(scratch, JSFunction::kPrototypeOrInitialMapOffset));
 
   if (FLAG_debug_code) {
-    __ AbortIfSmi(map);
+    __ AssertNotSmi(map);
     __ cmpb(FieldOperand(map, Map::kInstanceSizeOffset),
             instance_size >> kPointerSizeLog2);
     __ Assert(equal, "Unexpected instance size");