Revert "Add signed/unsigned 8-bit and 16-bit Representations to Crankshaft"

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index cc2b59ac6b28b74d050ada6ab8b6e40e9117d1db..a7503b3740f436ed89f022991ebd35d357560912 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -2432,8 +2432,7 @@ LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
       !(FLAG_track_double_fields && instr->field_representation().IsDouble());
 
   LOperand* val;
-  if (instr->field_representation().IsInteger8() ||
-      instr->field_representation().IsUInteger8()) {
+  if (instr->field_representation().IsByte()) {
     // mov_b requires a byte register (i.e. any of eax, ebx, ecx, edx).
     // Just force the value to be in eax and we're safe here.
     val = UseFixed(instr->value(), eax);