[clang] [llvm] [NVPTX] Change the alloca address space in NVPTXLowerAlloca (PR #154814)

[Theodoros Theodoridis via llvm-commits]

================
@@ -22,7 +22,7 @@
 ; CHECK: DEBUG_VALUE: foo:i <- 3
 ; CHECK: DEBUG_VALUE: foo:i <- 7
 ; CHECK: DEBUG_VALUE: foo:i <- %
-; CHECK: DEBUG_VALUE: foo:i <- [DW_OP_deref] $vrdepot
+; CHECK: DEBUG_VALUE: foo:i <- [DW_OP_deref] %
----------------
thetheodor wrote:

I'm not an expert either, but it looks correct to me:
The full debug annotation looks like this:   
```
        //DEBUG_VALUE: foo:i <- [DW_OP_deref] %1
        .loc    1 10 0                          // dbg-value-const-byref.c:10
```
which means that the value of `foo:i` at this location must be loaded through pointer `%1`.


And:
```
bb.0.entry:
  $vrframelocal64 = MOV_DEPOT_ADDR_64 0
  %0:b64 = LEA_ADDRi64 $vrframelocal64, 0
  %1:b64 = cvta_local_64 %0:b64
...
  ST_i32 %2:b32, 0, 0, 5, 32, $vrframelocal64, 0, debug-location !15 :: (store (s32) into %ir.i1, !tbaa !16, addrspace 5); dbg-value-const-byref.c:9
  DBG_VALUE %1:b64, $noreg, !"i", !DIExpression(DW_OP_deref), debug-location !20; dbg-value-const-byref.c:10 line no:6
...
```
`%1` points to this location. 




https://github.com/llvm/llvm-project/pull/154814