Subzero. Removes references to %ah.

src/IceRegistersX8632.h

 //===- subzero/src/IceRegistersX8632.h - Register information ---*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 60 matching lines @@
   /// An enum of X87 Stack Registers. The enum value does match the encoding
   /// used to binary encode register operands in instructions.
   enum X87STRegister {
 #define X(val, encode, name) Encoded_##val encode,
     X87ST_REGX8632_TABLE
 #undef X
         Encoded_Not_X87STReg = -1
   };
 
   static inline GPRRegister getEncodedGPR(int32_t RegNum) {
-    assert(Reg_GPR_First <= RegNum && RegNum <= Reg_GPR_Last);
+    assert(Reg_GPR_First <= RegNum);
+    assert(RegNum <= Reg_GPR_Last);
     return GPRRegister(RegNum - Reg_GPR_First);
   }
 
   static inline XmmRegister getEncodedXmm(int32_t RegNum) {
-    assert(Reg_XMM_First <= RegNum && RegNum <= Reg_XMM_Last);
+    assert(Reg_XMM_First <= RegNum);
+    assert(RegNum <= Reg_XMM_Last);
     return XmmRegister(RegNum - Reg_XMM_First);
   }
 
   static inline ByteRegister getEncodedByteReg(int32_t RegNum) {
-    assert(RegNum == Reg_ah || (Reg_GPR_First <= RegNum && RegNum <= Reg_ebx));
-    if (RegNum == Reg_ah)
-      return Encoded_Reg_ah;
+    assert(Reg_GPR_First <= RegNum);
+    assert(RegNum <= Reg_ebx);
     return ByteRegister(RegNum - Reg_GPR_First);
   }
 
   static inline GPRRegister getEncodedByteRegOrGPR(Type Ty, int32_t RegNum) {
     if (isByteSizedType(Ty))
       return GPRRegister(getEncodedByteReg(RegNum));
     else
       return getEncodedGPR(RegNum);
   }
 
   static inline X87STRegister getEncodedSTReg(int32_t RegNum) {
-    assert(Encoded_X87ST_First <= RegNum && RegNum <= Encoded_X87ST_Last);
+    assert(Encoded_X87ST_First <= RegNum);
+    assert(RegNum <= Encoded_X87ST_Last);
     return X87STRegister(RegNum);
   }
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEREGISTERSX8632_H