Fix issue 20190: Mark Uint32/Int32 typed data load to produce a Mint always

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
===================================================================
--- runtime/vm/intermediate_language_mips.cc	(revision 38626)
+++ runtime/vm/intermediate_language_mips.cc	(working copy)
@@ -1056,11 +1056,8 @@
 
     case kTypedDataInt32ArrayCid:
     case kTypedDataUint32ArrayCid:
-      // Result can be Smi or Mint when boxed.
-      // Instruction can deoptimize if we optimistically assumed that the result
-      // fits into Smi.
-      return CanDeoptimize() ? CompileType::FromCid(kSmiCid)
-                             : CompileType::Int();
+      return Typed32BitIsSmi()() ? CompileType::FromCid(kSmiCid)
+                                 : CompileType::FromCid(kMintCid);
 
     default:
       UNIMPLEMENTED();
@@ -1085,9 +1082,7 @@
       return kTagged;
     case kTypedDataInt32ArrayCid:
     case kTypedDataUint32ArrayCid:
-      // Instruction can deoptimize if we optimistically assumed that the result
-      // fits into Smi.
-      return CanDeoptimize() ? kTagged : kUnboxedMint;
+      return Typed32BitIsSmi() ? kTagged : kUnboxedMint;
     case kTypedDataFloat32ArrayCid:
     case kTypedDataFloat64ArrayCid:
       return kUnboxedDouble;