Reduce call to strlen when possible #4310

Job	Run time
Checks	5m 54s
Linux_x86_cpointer-32bit_Build_Correctness_Tests	1m 46s
OSX_x86-64_Build_Correctness_Unit_Tests	4m 28s
Linux_x86-64_Build_Correctness_Debugger_Tests	5m 1s
OSX_x86-64_Build_Correctness_Unit_Tests_Debug	3m 43s
Conformance_Tests_ESNext_Debug_A	2m 6s
Conformance_Tests_ESNext	2m 11s
Linux_x86-64_Build_Option_Tests	4m 24s
ASAN_Tests	3m 28s
ASAN_Tests_Debug	3m 41s
Clang_Unit_Build_Option_Tests	4m 19s
Conformance_Tests_ESNext_Debug_B	1m 18s
Linux_ARMv7l_Tests	5m 13s
Linux_ARMv7l_Tests_Debug	6m 6s
UBSAN_Tests	2m 18s
Unit_Tests	1m 48s
ESP_IDF_Build_Test	3m 39s
ESP8266_RTOS_SDK_Build_Test	1m 36s
Linux_AArch64_Tests	4m 22s
Linux_AArch64_Tests_Debug	6m 29s
MbedOS_K64F_Build_Test	1m 32s
Notification	0s
NuttX_STM32F4_Build_Test	2m 21s
RIOT_STM32F4_Build_Test	1m 1s
Zephyr_STM32F4_Build_Test	3m 5s
	1h 21m 49s

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