[llvm] [AMDGPU][NFC] Use range-based for loops in KD reserved bytes checks (PR #182340)

[Matt Arsenault via llvm-commits]

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@@ -2684,8 +2684,8 @@ Expected<bool> AMDGPUDisassembler::decodeKernelDescriptorDirective(
   case amdhsa::RESERVED0_OFFSET:
     // 4 reserved bytes, must be 0.
     ReservedBytes = DE.getBytes(Cursor, 4);
-    for (int I = 0; I < 4; ++I) {
-      if (ReservedBytes[I] != 0)
+    for (auto B : ReservedBytes) {
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arsenm wrote:

No auto? 

https://github.com/llvm/llvm-project/pull/182340