[config] Set the default stack size to 128 words #1106

Job	Run time
riscv-isa-sim	5m 24s
check-opcodes	7s
tc-gcc	52m 47s
tc-llvm	2h 12m 55s
verilator	11m 59s
verilator-model (minpool)	4m 3s
verilator-model (mempool)	17m 40s
build-apps-gcc (minpool)	58s
unit-test	1m 42s
build-apps-gcc (mempool)	1m 4s
build-apps-omp (minpool)	46s
check-bootrom	18s
build-apps-omp (mempool)	40s
run-apps-gcc (minpool)	24s
run-apps-gcc (mempool)	2m 34s
tc-halide	24m 45s
build-apps-llvm (minpool)	1m 19s
build-apps-llvm (mempool)	1m 17s
run-apps-llvm (minpool)	24s
run-apps-llvm (mempool)	2m 56s
build-apps-halide (minpool)	1m 30s
build-apps-halide (mempool)	1m 8s
run-apps-halide (minpool)	24s
run-apps-halide (mempool)	2m 47s
clean-up	5s
clean-up-compile-runs (minpool)	2s
clean-up-compile-runs (mempool)	6s
	4h 30m 4s

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