[llvm] [Offload][NFCI] Initialize the KernelArgsTy to default values (PR #95117)

[Joseph Huber via llvm-commits]

================
@@ -89,22 +89,26 @@ struct __tgt_async_info {
 
 /// This struct contains all of the arguments to a target kernel region launch.
 struct KernelArgsTy {
-  uint32_t Version;   // Version of this struct for ABI compatibility.
-  uint32_t NumArgs;   // Number of arguments in each input pointer.
-  void **ArgBasePtrs; // Base pointer of each argument (e.g. a struct).
-  void **ArgPtrs;     // Pointer to the argument data.
-  int64_t *ArgSizes;  // Size of the argument data in bytes.
-  int64_t *ArgTypes;  // Type of the data (e.g. to / from).
-  void **ArgNames;    // Name of the data for debugging, possibly null.
-  void **ArgMappers;  // User-defined mappers, possibly null.
-  uint64_t Tripcount; // Tripcount for the teams / distribute loop, 0 otherwise.
+  uint32_t Version = 0; // Version of this struct for ABI compatibility.
+  uint32_t NumArgs = 0; // Number of arguments in each input pointer.
+  void **ArgBasePtrs =
+      nullptr;                 // Base pointer of each argument (e.g. a struct).
+  void **ArgPtrs = nullptr;    // Pointer to the argument data.
+  int64_t *ArgSizes = nullptr; // Size of the argument data in bytes.
+  int64_t *ArgTypes = nullptr; // Type of the data (e.g. to / from).
+  void **ArgNames = nullptr;   // Name of the data for debugging, possibly null.
+  void **ArgMappers = nullptr; // User-defined mappers, possibly null.
+  uint64_t Tripcount =
+      0; // Tripcount for the teams / distribute loop, 0 otherwise.
   struct {
     uint64_t NoWait : 1; // Was this kernel spawned with a `nowait` clause.
     uint64_t Unused : 63;
-  } Flags;
-  uint32_t NumTeams[3];    // The number of teams (for x,y,z dimension).
-  uint32_t ThreadLimit[3]; // The number of threads (for x,y,z dimension).
-  uint32_t DynCGroupMem;   // Amount of dynamic cgroup memory requested.
+  } Flags = {0, 0};
+  uint32_t NumTeams[3] = {0, 0,
+                          0}; // The number of teams (for x,y,z dimension).
+  uint32_t ThreadLimit[3] = {0, 0,
+                             0}; // The number of threads (for x,y,z dimension).
----------------
jhuber6 wrote:

This looks bad, could we move the commend above?
```suggestion
  // The number of teams (for x,y,z dimension).
  uint32_t NumTeams[3] = {0, 0, 0};
   // The number of threads (for x,y,z dimension).
  uint32_t ThreadLimit[3] = {0, 0, 0};
```

https://github.com/llvm/llvm-project/pull/95117