[NVPTX] Fix barrier.ll LIT test

[asavonic]

Summary

The second parameter should be a multiple of the warp size (32).

PTX ISA spec, s9.7.12.1. Parallel Synchronization and Communication
Instructions: bar, barrier

barrier.sync{.aligned} a{, b};

Operand b specifies the number of threads participating in the
barrier. If no thread count is specified, all threads in the CTA
participate in the barrier. When specifying a thread count, the value
must be a multiple of the warp size.

llvm/test/CodeGen/NVPTX/barrier.ll

 ; RUN: llc < %s -march=nvptx64 -mcpu=sm_30 -mattr=+ptx60 | FileCheck %s
 
 declare void @llvm.nvvm.bar.warp.sync(i32)
 declare void @llvm.nvvm.barrier.sync(i32)
 declare void @llvm.nvvm.barrier.sync.cnt(i32, i32)
 
 ; CHECK-LABEL: .func{{.*}}barrier_sync
 define void @barrier_sync(i32 %id, i32 %cnt) {
   ; CHECK: ld.param.u32   [[ID:%r[0-9]+]], [barrier_sync_param_0];
   ; CHECK: ld.param.u32   [[CNT:%r[0-9]+]], [barrier_sync_param_1];
 
   ; CHECK:  barrier.sync [[ID]], [[CNT]];
   call void @llvm.nvvm.barrier.sync.cnt(i32 %id, i32 %cnt)
-  ; CHECK:  barrier.sync [[ID]], 2;
-  call void @llvm.nvvm.barrier.sync.cnt(i32 %id, i32 2)
+  ; CHECK:  barrier.sync [[ID]], 32;
+  call void @llvm.nvvm.barrier.sync.cnt(i32 %id, i32 32)
   ; CHECK:  barrier.sync 3, [[CNT]];
   call void @llvm.nvvm.barrier.sync.cnt(i32 3, i32 %cnt)
-  ; CHECK:  barrier.sync 4, 5;
-  call void @llvm.nvvm.barrier.sync.cnt(i32 4, i32 5)
+  ; CHECK:  barrier.sync 4, 64;
+  call void @llvm.nvvm.barrier.sync.cnt(i32 4, i32 64)
 
   ; CHECK: barrier.sync [[ID]];
   call void @llvm.nvvm.barrier.sync(i32 %id)
   ; CHECK: barrier.sync 1;
   call void @llvm.nvvm.barrier.sync(i32 1)
 
   ; CHECK: bar.warp.sync [[ID]];
   call void @llvm.nvvm.bar.warp.sync(i32 %id)
   ; CHECK: bar.warp.sync 6;
   call void @llvm.nvvm.bar.warp.sync(i32 6)
   ret void;
 }