[AArch64] Combine separate vector and scalar tablegen SDNode record for AArch64ISD::REV16. NFC (#125614)

Relax the SDTypeProfile for AArch64ISD::REV32/REV64 to remove the
requirement that the type be vector.

It's not a good idea to have two different SDNode records with different
SDTypeProfiles. SDTypeProfiles are used to remove some unneeded checks
from the GenDAGISel.inc. Having different SDTypeProfiles can cause
checks to be removed that can create ambiguous matches, but that did not
happen in this case.

With this change the AArchGenDAGISel.inc is identical. The only change
is AArch64GenGlobalISel.inc which now includes scalar patterns for
G_REV16 due to them now being picks up by an SDNodeEquiv. GISel does not
yet use G_REV16 for scalars so this is not a functional change.

Author: topperc

llvm/lib/Target/AArch64/AArch64InstrInfo.td

@@ -428,7 +428,6 @@ def SDT_AArch64cbz : SDTypeProfile<0, 2, [SDTCisInt<0>, SDTCisVT<1, OtherVT>]>;
 def SDT_AArch64tbz : SDTypeProfile<0, 3, [SDTCisInt<0>, SDTCisInt<1>,
                                         SDTCisVT<2, OtherVT>]>;
 
-
 def SDT_AArch64CSel  : SDTypeProfile<1, 4,
                                    [SDTCisSameAs<0, 1>,
                                     SDTCisSameAs<0, 2>,
@@ -451,6 +450,7 @@ def SDT_AArch64FCCMP : SDTypeProfile<1, 5,
 def SDT_AArch64FCmp  : SDTypeProfile<1, 2, [SDTCisVT<0, i32>,
                                             SDTCisFP<1>,
                                             SDTCisSameAs<2, 1>]>;
+def SDT_AArch64Rev : SDTypeProfile<1, 1, [SDTCisSameAs<0, 1>]>;
 def SDT_AArch64Dup   : SDTypeProfile<1, 1, [SDTCisVec<0>]>;
 def SDT_AArch64DupLane   : SDTypeProfile<1, 2, [SDTCisVec<0>, SDTCisInt<2>]>;
 def SDT_AArch64Insr  : SDTypeProfile<1, 2, [SDTCisVec<0>]>;
@@ -817,11 +817,9 @@ def AArch64mvni_msl : SDNode<"AArch64ISD::MVNImsl", SDT_AArch64MOVIshift>;
 def AArch64movi : SDNode<"AArch64ISD::MOVI", SDT_AArch64MOVIedit>;
 def AArch64fmov : SDNode<"AArch64ISD::FMOV", SDT_AArch64MOVIedit>;
 
-def AArch64rev16_scalar : SDNode<"AArch64ISD::REV16", SDTIntUnaryOp>;
-
-def AArch64rev16 : SDNode<"AArch64ISD::REV16", SDT_AArch64UnaryVec>;
-def AArch64rev32 : SDNode<"AArch64ISD::REV32", SDT_AArch64UnaryVec>;
-def AArch64rev64 : SDNode<"AArch64ISD::REV64", SDT_AArch64UnaryVec>;
+def AArch64rev16 : SDNode<"AArch64ISD::REV16", SDT_AArch64Rev>;
+def AArch64rev32 : SDNode<"AArch64ISD::REV32", SDT_AArch64Rev>;
+def AArch64rev64 : SDNode<"AArch64ISD::REV64", SDT_AArch64Rev>;
 def AArch64ext : SDNode<"AArch64ISD::EXT", SDT_AArch64ExtVec>;
 
 def AArch64vashr : SDNode<"AArch64ISD::VASHR", SDT_AArch64vshift>;
@@ -3000,8 +2998,8 @@ def : Pat<(bswap (rotr GPR64:$Rn, (i64 32))), (REV32Xr GPR64:$Rn)>;
 def : Pat<(srl (bswap top16Zero:$Rn), (i64 16)), (REV16Wr GPR32:$Rn)>;
 def : Pat<(srl (bswap top32Zero:$Rn), (i64 32)), (REV32Xr GPR64:$Rn)>;
 
-def : Pat<(AArch64rev16_scalar GPR32:$Rn), (REV16Wr GPR32:$Rn)>;
-def : Pat<(AArch64rev16_scalar GPR64:$Rn), (REV16Xr GPR64:$Rn)>;
+def : Pat<(AArch64rev16 GPR32:$Rn), (REV16Wr GPR32:$Rn)>;
+def : Pat<(AArch64rev16 GPR64:$Rn), (REV16Xr GPR64:$Rn)>;
 
 def : Pat<(or (and (srl GPR64:$Rn, (i64 8)), (i64 0x00ff00ff00ff00ff)),
               (and (shl GPR64:$Rn, (i64 8)), (i64 0xff00ff00ff00ff00))),