Subzero: ARM32: lowering of vector insert and extract.

src/IceRegistersARM32.h

Index: src/IceRegistersARM32.h
diff --git a/src/IceRegistersARM32.h b/src/IceRegistersARM32.h
index 94f45c137557cb8b03329330ccb0ae547ca1ea76..1ce05ab8605284e8f5e3a199df0058eaeb4c95c7 100644
--- a/src/IceRegistersARM32.h
+++ b/src/IceRegistersARM32.h
@@ -219,8 +219,12 @@ static inline IceString getRegName(int32_t RegNum) {
   return RegTable[RegNum].Name;
 }
 
-// Extend enum RegClass with ARM32-specific register classes (if any).
-enum RegClassARM32 : uint8_t { RCARM32_NUM = RC_Target };
+// Extend enum RegClass with ARM32-specific register classes.
+enum RegClassARM32 : uint8_t {
+  RCARM32_QtoS = RC_Target, // Denotes Q registers that are aliased by S
+                            // registers.
+  RCARM32_NUM
+};
 
 } // end of namespace RegARM32
 } // end of namespace ARM32