Optimize LCache entrys keys

[rerobika]

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

[rerobika]

Perf results:

Benchmark	Perf (sec)
3d-cube.js	0.798 -> 0.786 : +1.491%
3d-raytrace.js	0.965 -> 0.954 : +1.192%
access-binary-trees.js	0.528 -> 0.519 : +1.703%
access-fannkuch.js	1.920 -> 1.874 : +2.365%
access-nbody.js	1.013 -> 1.015 : -0.254%
bitops-3bit-bits-in-byte.js	0.470 -> 0.470 : +0.022%
bitops-bits-in-byte.js	0.644 -> 0.644 : -0.002%
bitops-bitwise-and.js	0.891 -> 0.867 : +2.648%
bitops-nsieve-bits.js	1.126 -> 1.090 : +3.257%
controlflow-recursive.js	0.342 -> 0.333 : +2.531%
crypto-aes.js	0.808 -> 0.786 : +2.794%
crypto-md5.js	0.538 -> 0.533 : +0.961%
crypto-sha1.js	0.539 -> 0.537 : +0.413%
date-format-tofte.js	0.725 -> 0.718 : +0.978%
date-format-xparb.js	0.502 -> 0.506 : -0.776%
math-cordic.js	1.122 -> 1.107 : +1.371%
math-partial-sums.js	0.695 -> 0.698 : -0.456%
math-spectral-norm.js	0.472 -> 0.474 : -0.514%
string-base64.js	1.338 -> 1.335 : +0.220%
string-fasta.js	1.290 -> 1.268 : +1.696%
Geometric mean:	+1.089%

Binary (bytes)	master(a1fdcf0)	patch(ceb0ab2)	Diff
size	132664	132664	0 bytes
.rodata	11255	11255	0 bytes
.dynstr	262	262	0 bytes
.rel.plt	176	176	0 bytes
.interp	25	25	0 bytes
.dynsym	384	384	0 bytes
.gnu.hash	188	188	0 bytes
.text	114404	114260	-144 bytes
.comment	59	59	0 bytes
.shstrtab	250	250	0 bytes
.data	8	8	0 bytes
.ARM.exidx	8	8	0 bytes
.rel.dyn	16	16	0 bytes
.init	12	12	0 bytes
.got	104	104	0 bytes
.plt	288	288	0 bytes
.note.gnu.build-id	36	36	0 bytes
.note.ABI-tag	32	32	0 bytes
.gnu.version_r	64	64	0 bytes
.bss	1575168	1575168	0 bytes
.fini	8	8	0 bytes
.gnu.version	48	48	0 bytes
.fini_array	4	4	0 bytes
.init_array	4	4	0 bytes
.dynamic	232	232	0 bytes
.eh_frame	4	4	0 bytes
.ARM.attributes	51	51	0 bytes
.jcr	4	4	0 bytes

[dbatyai]

Looks good overall.

[dbatyai]

lgtm

[galpeter]

lgtm