[Clang][SVE2.1] Add builtins for svrevd

As described in: ARM-software/acle#257

Patch by: Rosie Sumpter <[email protected]>

Reviewed By: dtemirbulatov

Differential Revision: https://reviews.llvm.org/D151709

Author: CarolineConcatto

clang/include/clang/Basic/arm_sve.td

@@ -1977,4 +1977,6 @@ def SVPSEL_S : SInst<"svpsel_lane_b32", "PPPm", "Pi", MergeNone, "", [], []>;
 def SVPSEL_D : SInst<"svpsel_lane_b64", "PPPm", "Pl", MergeNone, "", [], []>;
 
 def SVCNTP_COUNT : SInst<"svcntp_{d}", "n}i", "QcQsQiQl", MergeNone, "aarch64_sve_cntp_{d}", [IsOverloadNone], [ImmCheck<1, ImmCheck2_4_Mul2>]>;
+
+defm SVREVD : SInstZPZ<"svrevd", "csilUcUsUiUl", "aarch64_sve_revd">;
 }