[MC] Use FirstTargetSpecifier

Author: MaskRay

llvm/lib/Target/Hexagon/MCTargetDesc/HexagonMCExpr.h

@@ -14,12 +14,10 @@
 namespace llvm {
 class HexagonMCExpr : public MCTargetExpr {
 public:
-  enum VariantKind {
+  enum VariantKind : uint8_t {
     VK_None,
 
-    // While not strictly necessary, start at a larger number to avoid confusion
-    // with MCSymbolRefExpr::VariantKind.
-    VK_DTPREL = 100,
+    VK_DTPREL = MCSymbolRefExpr::FirstTargetSpecifier,
     VK_GD_GOT,
     VK_GD_PLT,
     VK_GOT,

llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCExpr.h

@@ -17,12 +17,10 @@ namespace llvm {
 
 class PPCMCExpr : public MCTargetExpr {
 public:
-  enum Specifier {
+  enum Specifier : uint8_t {
     VK_None,
 
-    // We currently use both MCSymbolRefExpr::VariantKind and
-    // PPCMCExpr::Specifier. Start at a larger number to avoid conflicts.
-    VK_LO = 200,
+    VK_LO = MCSymbolRefExpr::FirstTargetSpecifier,
     VK_HI,
     VK_HA,
     VK_HIGH,

llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCExpr.h

@@ -22,9 +22,9 @@ class StringRef;
 
 class RISCVMCExpr : public MCTargetExpr {
 public:
-  enum Specifier {
+  enum Specifier : uint8_t {
     VK_None,
-    VK_LO,
+    VK_LO = MCSymbolRefExpr::FirstTargetSpecifier,
     VK_HI,
     VK_PCREL_LO,
     VK_PCREL_HI,