[BOLT][NFC] Use isInt<> instead of range checks

Summary: Reuse LLVM isInt check

Reviewed By: maksfb

FBD33945182

Author: aaupov

bolt/lib/Target/X86/X86MCPlusBuilder.cpp

@@ -1873,13 +1873,9 @@ class X86MCPlusBuilder : public MCPlusBuilder {
       NewOpcode = Check.second;
       if (Check.first == NOCHECK)
         break;
-      if (Check.first == CHECK8 &&
-          ImmVal >= std::numeric_limits<int8_t>::min() &&
-          ImmVal <= std::numeric_limits<int8_t>::max())
+      if (Check.first == CHECK8 && isInt<8>(ImmVal))
         break;
-      if (Check.first == CHECK32 &&
-          ImmVal >= std::numeric_limits<int32_t>::min() &&
-          ImmVal <= std::numeric_limits<int32_t>::max())
+      if (Check.first == CHECK32 && isInt<32>(ImmVal))
         break;
     }
     if (NewOpcode == Inst.getOpcode())
@@ -3012,12 +3008,9 @@ class X86MCPlusBuilder : public MCPlusBuilder {
       NewOpcode = Check.second;
       if (Check.first == NOCHECK)
         break;
-      if (Check.first == CHECK8 && Imm >= std::numeric_limits<int8_t>::min() &&
-          Imm <= std::numeric_limits<int8_t>::max())
+      if (Check.first == CHECK8 && isInt<8>(Imm))
         break;
-      if (Check.first == CHECK32 &&
-          Imm >= std::numeric_limits<int32_t>::min() &&
-          Imm <= std::numeric_limits<int32_t>::max())
+      if (Check.first == CHECK32 && isInt<32>(Imm))
         break;
     }
     if (NewOpcode == Inst.getOpcode())