[llvm] [AMDGPU] Ignore inactive VGPRs in .vgpr_count (PR #149052)

[Matt Arsenault via llvm-commits]

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@@ -1367,6 +1367,28 @@ constexpr bool isEntryFunctionCC(CallingConv::ID CC) {
   }
 }
 
+// Shaders that are entry functions need to count input arguments even if
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arsenm wrote:

When you do reordering and reparenting, graphite is trying to create temporary branch names that don't respect the users/username prefix rule 

https://github.com/llvm/llvm-project/pull/149052