Allocate global variables on heap instead of stack in pnut-exe #373

Job	Run time
bootstrap-bash-2_05a	2m 26s
bootstrap-pnut-sh (bash)	1m 25s
bootstrap-pnut-exe (bash, i386_linux)	2m 26s
bootstrap-pnut-sh (dash)	2m 9s
bootstrap-pnut-sh-with-pnut-exe (i386_linux)	12s
build-without-warnings	30s
bootstrap-pnut-sh (ksh)	45s
bootstrap-pnut-sh-with-pnut-exe (x86_64_linux)	11s
bootstrap-pnut-sh (mksh)	2m 25s
bootstrap-pnut-sh-with-pnut-exe (x86_64_mac)	16s
bootstrap-pnut-exe (bash, x86_64_linux)	2m 26s
bootstrap-pnut-sh (yash)	1m 51s
catch-bad-whitespace	3s
bootstrap-pnut-exe (bash, x86_64_mac)	2m 28s
bootstrap-pnut-sh (zsh)	2m 25s
compile-in-safe-mode	15s
bootstrap-pnut-exe (dash, i386_linux)	2m 26s
bootstrap-pnut-exe (dash, x86_64_linux)	2m 25s
pnut-variants-run (reader)	23s
bootstrap-pnut-exe (dash, x86_64_mac)	2m 27s
pnut-variants-run (tokenizer)	43s
tests-exe (i386_linux, ubuntu-latest)	10s
tests-shell (bash)	20s
bootstrap-pnut-exe (ksh, i386_linux)	1m 54s
tests-exe (x86_64_linux, ubuntu-latest)	11s
pnut-variants-run (parser)	44s
bootstrap-pnut-exe (ksh, x86_64_linux)	1m 59s
tests-shell (dash)	20s
tests-exe (x86_64_mac, macos-latest)	14s
bootstrap-pnut-exe (ksh, x86_64_mac)	1m 16s
tests-shell (ksh)	26s
tests-shell (mksh)	56s
tests-shell (yash)	50s
tests-shell (zsh)	34s
success-message	1s
	40m 32s

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