Revert of Removes uint8_t from MachineRepresentation and MachineSemantic enums.

src/machine-type.h

Index: src/machine-type.h
diff --git a/src/machine-type.h b/src/machine-type.h
index fd1d41dcc3a2dd3f8da800c02fd03bcf47c64d64..a59aced36ea3323491b1b0a6f39cb3e3cc3cecd3 100644
--- a/src/machine-type.h
+++ b/src/machine-type.h
@@ -15,7 +15,7 @@
 namespace v8 {
 namespace internal {
 
-enum class MachineRepresentation {
+enum class MachineRepresentation : uint8_t {
   kNone,
   kBit,
   kWord8,
@@ -39,7 +39,7 @@
 
 const char* MachineReprToString(MachineRepresentation);
 
-enum class MachineSemantic {
+enum class MachineSemantic : uint8_t {
   kNone,
   kBool,
   kInt32,