Reduce call to strlen when possible #4312

Job	Run time
Checks	5m 21s
Linux_x86_cpointer-32bit_Build_Correctness_Tests	2m 31s
Linux_x86-64_Build_Correctness_Debugger_Tests	5m 0s
OSX_x86-64_Build_Correctness_Unit_Tests	3m 59s
Clang_Unit_Build_Option_Tests	4m 9s
Conformance_Tests_ESNext	2m 9s
OSX_x86-64_Build_Correctness_Unit_Tests_Debug	3m 52s
Conformance_Tests_ESNext_Debug_A	2m 10s
Conformance_Tests_ESNext_Debug_B	1m 20s
Linux_x86-64_Build_Option_Tests	4m 22s
Unit_Tests	1m 49s
ASAN_Tests	3m 24s
ASAN_Tests_Debug	3m 23s
Linux_AArch64_Tests	4m 34s
Linux_AArch64_Tests_Debug	6m 27s
Linux_ARMv7l_Tests	4m 41s
Linux_ARMv7l_Tests_Debug	6m 15s
MbedOS_K64F_Build_Test	1m 38s
NuttX_STM32F4_Build_Test	2m 7s
UBSAN_Tests	2m 34s
Zephyr_STM32F4_Build_Test	3m 0s
ESP_IDF_Build_Test	3m 41s
ESP8266_RTOS_SDK_Build_Test	1m 32s
Notification	0s
RIOT_STM32F4_Build_Test	1m 28s
	1h 21m 26s

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