[halide] Upgrade Halide to 15.0.0 #1313

Job	Run time
tc-llvm	4m 6s
verilator	17s
riscv-isa-sim	14s
check-opcodes	3s
tc-gcc	1m 32s
verilator-model (minpool)	11s
verilator-model (mempool)	16s
build-apps-omp (minpool)	32s
build-apps-gcc (minpool)	50s
build-apps-omp (mempool)	1m 5s
unit-test	1m 31s
build-apps-gcc (mempool)	57s
check-bootrom	16s
run-apps-gcc (minpool)	23s
run-apps-gcc (mempool)	1m 35s
tc-halide	10m 22s
build-apps-llvm (minpool)	1m 5s
build-apps-llvm (mempool)	1m 13s
run-apps-llvm (minpool)	28s
run-apps-llvm (mempool)	1m 37s
build-apps-halide (minpool)	1m 19s
build-apps-halide (mempool)	1m 16s
run-apps-halide (minpool)	27s
run-apps-halide (mempool)	1m 46s
clean-up-compile-runs (minpool)	2s
clean-up	3s
clean-up-compile-runs (mempool)	1s
	33m 27s

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