[llvm] [AMDGPU] Remove dead check lines from tests (NFC) (PR #228002)

[Jay Foad via llvm-commits]

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@@ -306,7 +306,6 @@ define i16 @get_grid_dims_i16() #2 {
 
 ; Ignore wrong type
 define half @get_grid_dims_f16() #2 {
-; GCN-half: @get_grid_dims_i16(
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jayfoad wrote:

This is fine.

https://github.com/llvm/llvm-project/pull/228002