[AMDGPU] Remove hasPostISelHook for atomics. NFC. (llvm#116791)

This is not required since 2147b6c changed that way that no-ret
atomic ops are selected.

Author: jayfoad

llvm/lib/Target/AMDGPU/BUFInstructions.td

@@ -740,7 +740,6 @@ class MUBUF_Atomic_Pseudo<string opName,
     MUBUF_SetupAddr<addrKindCopy> {
   let mayStore = 1;
   let mayLoad = 1;
-  let hasPostISelHook = 1;
   let hasSideEffects = 1;
   let DisableWQM = 1;
   let has_glc = 0;

llvm/lib/Target/AMDGPU/DSInstructions.td

@@ -194,7 +194,6 @@ class DS_1A1D_RET <string opName, RegisterClass rc = VGPR_32,
   (ins VGPR_32:$addr, data_op:$data0, Offset:$offset, gds:$gds),
   " $vdst, $addr, $data0$offset$gds"> {
 
-  let hasPostISelHook = 1;
   let has_data1 = 0;
   let IsAtomicRet = 1;
 }
@@ -223,7 +222,6 @@ class DS_1A2D_RET<string opName,
   (ins VGPR_32:$addr, src_op:$data0, src_op:$data1, Offset:$offset, gds:$gds),
   " $vdst, $addr, $data0, $data1$offset$gds"> {
 
-  let hasPostISelHook = 1;
   let IsAtomicRet = 1;
 }
 
@@ -248,7 +246,6 @@ class DS_1A2D_Off8_RET<string opName,
   " $vdst, $addr, $data0, $data1$offset0$offset1$gds"> {
 
   let has_offset = 0;
-  let hasPostISelHook = 1;
 }
 
 multiclass DS_1A2D_Off8_RET_mc<string opName,

llvm/lib/Target/AMDGPU/FLATInstructions.td

@@ -516,7 +516,6 @@ class FLAT_AtomicNoRet_Pseudo<string opName, dag outs, dag ins,
 class FLAT_AtomicRet_Pseudo<string opName, dag outs, dag ins,
                             string asm, list<dag> pattern = []>
   : FLAT_AtomicNoRet_Pseudo<opName, outs, ins, asm, pattern> {
-  let hasPostISelHook = 1;
   let has_vdst = 1;
   let glcValue = 1;
   let sccbValue = 0;