Reduce call to strlen when possible #4344

Job	Run time
ASAN_Tests_Debug	3m 55s
ASAN_Tests	3m 30s
Clang_Unit_Build_Option_Tests	5m 5s
Checks	5m 12s
Conformance_Tests_ESNext	2m 8s
Conformance_Tests_ESNext_Debug_A	2m 6s
Conformance_Tests_ESNext_Debug_B	1m 22s
ESP_IDF_Build_Test	4m 0s
Linux_AArch64_Tests	4m 29s
Linux_AArch64_Tests_Debug	6m 34s
ESP8266_RTOS_SDK_Build_Test	1m 30s
Linux_ARMv7l_Tests	4m 44s
Linux_ARMv7l_Tests_Debug	6m 5s
Linux_x86_cpointer-32bit_Build_Correctness_Tests	1m 47s
Linux_x86-64_Build_Correctness_Debugger_Tests	5m 2s
Linux_x86-64_Build_Option_Tests	4m 45s
MbedOS_K64F_Build_Test	1m 24s
Notification	0s
NuttX_STM32F4_Build_Test	2m 38s
OSX_x86-64_Build_Correctness_Unit_Tests	4m 47s
OSX_x86-64_Build_Correctness_Unit_Tests_Debug	5m 9s
RIOT_STM32F4_Build_Test	52s
UBSAN_Tests	2m 17s
Unit_Tests	1m 49s
Zephyr_STM32F4_Build_Test	3m 6s
	1h 24m 16s

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