Fix interpreter-assembler-unittest to check poisoning on unaligned loads

Check for poisoned loads in unaligned loads in
interpreter-assembler-unittest node matcher.

Change-Id: I5007ed1767edb035181c66028dda064b7792267f
Reviewed-on: https://chromium-review.googlesource.com/1018902Reviewed-by: Miran Karić <miran.karic@mips.com>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52700}

test/unittests/interpreter/interpreter-assembler-unittest.cc

@@ -127,7 +127,8 @@ InterpreterAssemblerTest::InterpreterAssemblerForTest::IsUnsignedShortOperand(
           c::IsParameter(InterpreterDispatchDescriptor::kBytecodeArray),
           c::IsIntPtrAdd(
               c::IsParameter(InterpreterDispatchDescriptor::kBytecodeOffset),
-              c::IsIntPtrConstant(offset + kMsbOffset + kStep * i)));
+              c::IsIntPtrConstant(offset + kMsbOffset + kStep * i)),
+          needs_poisoning);
     }
     return c::IsWord32Or(
         c::IsWord32Shl(bytes[0], c::IsInt32Constant(kBitsPerByte)), bytes[1]);