Reduce call to strlen when possible #4307

Job	Run time
Clang_Unit_Build_Option_Tests	4m 13s
ASAN_Tests	3m 37s
ASAN_Tests_Debug	3m 34s
Checks	5m 46s
Conformance_Tests_ESNext	2m 11s
Conformance_Tests_ESNext_Debug_A	2m 16s
ESP_IDF_Build_Test	3m 38s
Conformance_Tests_ESNext_Debug_B	1m 21s
ESP8266_RTOS_SDK_Build_Test	1m 28s
Linux_AArch64_Tests_Debug	6m 37s
Linux_AArch64_Tests	4m 42s
Linux_ARMv7l_Tests	4m 30s
Linux_ARMv7l_Tests_Debug	6m 2s
Linux_x86_cpointer-32bit_Build_Correctness_Tests	2m 22s
Linux_x86-64_Build_Correctness_Debugger_Tests	5m 2s
Linux_x86-64_Build_Option_Tests	4m 39s
MbedOS_K64F_Build_Test	1m 39s
Notification	0s
NuttX_STM32F4_Build_Test	2m 12s
OSX_x86-64_Build_Correctness_Unit_Tests	3m 1s
OSX_x86-64_Build_Correctness_Unit_Tests_Debug	3m 53s
RIOT_STM32F4_Build_Test	1m 6s
UBSAN_Tests	2m 14s
Unit_Tests	1m 51s
Zephyr_STM32F4_Build_Test	4m 36s
	1h 22m 30s

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