Reduce call to strlen when possible #4329

Job	Run time
Checks	5m 21s
Linux_x86-64_Build_Correctness_Debugger_Tests	4m 59s
Conformance_Tests_ESNext	2m 8s
Clang_Unit_Build_Option_Tests	4m 44s
Conformance_Tests_ESNext_Debug_A	2m 10s
ASAN_Tests	3m 32s
Conformance_Tests_ESNext_Debug_B	1m 20s
Linux_x86_cpointer-32bit_Build_Correctness_Tests	1m 47s
Linux_x86-64_Build_Option_Tests	4m 16s
OSX_x86-64_Build_Correctness_Unit_Tests	3m 11s
OSX_x86-64_Build_Correctness_Unit_Tests_Debug	3m 31s
Unit_Tests	1m 47s
ASAN_Tests_Debug	3m 29s
Linux_AArch64_Tests	4m 33s
Linux_AArch64_Tests_Debug	6m 28s
Linux_ARMv7l_Tests	4m 30s
Linux_ARMv7l_Tests_Debug	6m 9s
MbedOS_K64F_Build_Test	1m 39s
NuttX_STM32F4_Build_Test	2m 19s
UBSAN_Tests	2m 16s
Zephyr_STM32F4_Build_Test	3m 12s
ESP_IDF_Build_Test	3m 31s
ESP8266_RTOS_SDK_Build_Test	1m 31s
Notification	0s
RIOT_STM32F4_Build_Test	52s
	1h 19m 15s

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