[turbofan] Byte and word memory operands in x64 cmp/test. Fixes arithmetic_op_8 in assembler-x64.cc

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 28966253210c4df158d015e71c3d16f3022fb2a0..ac70a0c5ddab43dc6fdaaeea9d769c0de7f2be7e 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -839,12 +839,24 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kX64And:
       ASSEMBLE_BINOP(andq);
       break;
+    case kX64Cmp8:
+      ASSEMBLE_COMPARE(cmpb);
+      break;
+    case kX64Cmp16:
+      ASSEMBLE_COMPARE(cmpw);
+      break;
     case kX64Cmp32:
       ASSEMBLE_COMPARE(cmpl);
       break;
     case kX64Cmp:
       ASSEMBLE_COMPARE(cmpq);
       break;
+    case kX64Test8:
+      ASSEMBLE_COMPARE(testb);
+      break;
+    case kX64Test16:
+      ASSEMBLE_COMPARE(testw);
+      break;
     case kX64Test32:
       ASSEMBLE_COMPARE(testl);
       break;