[CK] Fix/suppress clang lifetimebound warnings with staging compiler. (#6550)

## Motivation

New changes from upstream llvm-project cause an avalanche of warnings in
CK. Gonna disable them by ignoring the
lifetime-safety-intra-tu-suggestions flag until a better permanent
solution is found.

## Technical Details

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## Test Plan

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## Test Result

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## Submission Checklist

- [ ] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

include/ck_tile/ops/flatmm/kernel/flatmm_kernel.hpp

@@ -10,6 +10,9 @@
 #include "ck_tile/ops/common.hpp"
 #include "ck_tile/ops/gemm/pipeline/gemm_pipeline_ag_bg_cr_scheduler.hpp"
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wlifetime-safety-intra-tu-suggestions"
+
 namespace ck_tile {
 struct FlatmmProblem
 {
@@ -970,3 +973,5 @@ struct FlatmmKernel
 };
 
 } // namespace ck_tile
+
+#pragma clang diagnostic pop