Revert "Add support to load/store byte fields." and "MIPS: Add support to load/store byte fields.".

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index c564872da622fb91dcd429336d5bd2d23fde0713..c1aaec0e18e2304969b557c524188a6fc3298abd 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -5954,9 +5954,7 @@ class HLoadNamedField V8_FINAL : public HTemplateInstruction<1> {
     SetOperandAt(0, object);
 
     Representation representation = access.representation();
-    if (representation.IsByte()) {
-      set_representation(Representation::Integer32());
-    } else if (representation.IsSmi()) {
+    if (representation.IsSmi()) {
       set_type(HType::Smi());
       set_representation(representation);
     } else if (representation.IsDouble() ||
@@ -6254,14 +6252,11 @@ class HStoreNamedField V8_FINAL : public HTemplateInstruction<3> {
     if (index == 0 && access().IsExternalMemory()) {
       // object must be external in case of external memory access
       return Representation::External();
-    } else if (index == 1) {
-      if (field_representation().IsByte() ||
-          field_representation().IsInteger32()) {
-        return Representation::Integer32();
-      } else if (field_representation().IsDouble() ||
-                 field_representation().IsSmi()) {
-        return field_representation();
-      }
+    } else if (index == 1 &&
+        (field_representation().IsDouble() ||
+         field_representation().IsSmi() ||
+         field_representation().IsInteger32())) {
+      return field_representation();
     }
     return Representation::Tagged();
   }