[AMDGPU] Add both mayLoad and mayStore to MUBUF LDS opcodes

[rampitec]

Forgot this in previous commit.

llvm/lib/Target/AMDGPU/BUFInstructions.td

: MUBUF_Pseudo<opName,
     MUBUF_SetupAddr<addrKindCopy> {
   let PseudoInstr = opName # !if(isLds, "_lds", "") #
                     "_" # getAddrName<addrKindCopy>.ret;
   let AsmMatchConverter = !if(isLds, "cvtMubufLds", "cvtMubuf");
 
   let Constraints = !if(HasTiedDest, "$vdata = $vdata_in", "");
   let LGKM_CNT = isLds;
   let mayLoad = 1;
-  let mayStore = 0;
+  let mayStore = isLds;
   let maybeAtomic = 1;
   let Uses = !if(isLds, [EXEC, M0], [EXEC]);
   let has_tfe = !not(isLds);
   let lds = isLds;
   let elements = getMUBUFElements<vdata_vt>.ret;
   let VALU = isLds;
 }
 

 }
 
 class MUBUF_Pseudo_Store_Lds<string opName>
   : MUBUF_Pseudo<opName,
                  (outs),
                  (ins SReg_128:$srsrc, SCSrc_b32:$soffset, offset:$offset, CPol:$cpol, SWZ:$swz),
                  " $srsrc, $soffset$offset lds$cpol$swz"> {
   let LGKM_CNT = 1;
-  let mayLoad = 0;
+  let mayLoad = 1;
   let mayStore = 1;
   let maybeAtomic = 1;
 
   let has_vdata = 0;
   let has_vaddr = 0;
   let has_tfe = 0;
   let lds = 1;
   let VALU = 1;