Add testcases, proving that bug [e38dce74e2] is not present in 8.6 #4551

Job	Run time
gcc	3m 24s
gcc (--disable-shared)	3m 24s
gcc (--enable-symbols)	3m 16s
gcc (--enable-symbols=mem)	4m 4s
gcc (--enable-symbols=all)	4m 10s
gcc (CFLAGS=-ftrapv)	3m 32s
gcc (CFLAGS=-DTCL_UTF_MAX=4)	3m 27s
gcc (CFLAGS=-DTCL_UTF_MAX=6)	3m 25s
gcc (CFLAGS=-m32 CPPFLAGS=-m32 LDFLAGS=-m32 --disable-64bit)	3m 42s
	32m 24s

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