Reduce call to strlen when possible #4341

Job	Run time
ASAN_Tests_Debug	3m 25s
ASAN_Tests	4m 46s
Clang_Unit_Build_Option_Tests	4m 45s
Checks	5m 18s
Conformance_Tests_ESNext	2m 6s
Conformance_Tests_ESNext_Debug_B	1m 17s
Conformance_Tests_ESNext_Debug_A	2m 16s
ESP_IDF_Build_Test	3m 28s
ESP8266_RTOS_SDK_Build_Test	1m 33s
Linux_AArch64_Tests	4m 29s
Linux_AArch64_Tests_Debug	6m 41s
Linux_ARMv7l_Tests	4m 30s
Linux_ARMv7l_Tests_Debug	6m 13s
Linux_x86_cpointer-32bit_Build_Correctness_Tests	1m 42s
Linux_x86-64_Build_Correctness_Debugger_Tests	5m 6s
Linux_x86-64_Build_Option_Tests	4m 24s
MbedOS_K64F_Build_Test	1m 33s
Notification	0s
OSX_x86-64_Build_Correctness_Unit_Tests	3m 36s
NuttX_STM32F4_Build_Test	2m 5s
OSX_x86-64_Build_Correctness_Unit_Tests_Debug	5m 4s
RIOT_STM32F4_Build_Test	56s
UBSAN_Tests	2m 24s
Unit_Tests	1m 46s
Zephyr_STM32F4_Build_Test	3m 2s
	1h 22m 25s

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