Reduce call to strlen when possible #4328

Job	Run time
Checks	5m 30s
Conformance_Tests_ESNext_Debug_B	1m 26s
Conformance_Tests_ESNext	2m 11s
Linux_x86_cpointer-32bit_Build_Correctness_Tests	1m 43s
Linux_x86-64_Build_Correctness_Debugger_Tests	5m 1s
Linux_x86-64_Build_Option_Tests	4m 17s
OSX_x86-64_Build_Correctness_Unit_Tests	3m 28s
OSX_x86-64_Build_Correctness_Unit_Tests_Debug	4m 30s
ASAN_Tests	3m 31s
ASAN_Tests_Debug	3m 30s
Clang_Unit_Build_Option_Tests	4m 13s
Linux_AArch64_Tests	4m 26s
Conformance_Tests_ESNext_Debug_A	2m 6s
Linux_AArch64_Tests_Debug	6m 35s
Linux_ARMv7l_Tests	4m 33s
Linux_ARMv7l_Tests_Debug	6m 0s
MbedOS_K64F_Build_Test	1m 26s
UBSAN_Tests	2m 18s
Unit_Tests	1m 56s
ESP_IDF_Build_Test	3m 33s
ESP8266_RTOS_SDK_Build_Test	1m 36s
Notification	0s
NuttX_STM32F4_Build_Test	2m 5s
RIOT_STM32F4_Build_Test	58s
Zephyr_STM32F4_Build_Test	3m 2s
	1h 19m 54s

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