Reduce call to strlen when possible #4327

Job	Run time
OSX_x86-64_Build_Correctness_Unit_Tests	3m 3s
Linux_x86_cpointer-32bit_Build_Correctness_Tests	1m 42s
Conformance_Tests_ESNext	2m 6s
Checks	5m 30s
Conformance_Tests_ESNext_Debug_A	2m 10s
Conformance_Tests_ESNext_Debug_B	1m 20s
Linux_x86-64_Build_Correctness_Debugger_Tests	4m 58s
OSX_x86-64_Build_Correctness_Unit_Tests_Debug	3m 44s
Linux_x86-64_Build_Option_Tests	4m 27s
ASAN_Tests	3m 31s
Clang_Unit_Build_Option_Tests	4m 24s
ASAN_Tests_Debug	4m 0s
Linux_AArch64_Tests	4m 30s
Linux_AArch64_Tests_Debug	6m 40s
Linux_ARMv7l_Tests	4m 32s
Linux_ARMv7l_Tests_Debug	6m 5s
UBSAN_Tests	2m 13s
ESP_IDF_Build_Test	3m 31s
Unit_Tests	1m 54s
ESP8266_RTOS_SDK_Build_Test	1m 27s
MbedOS_K64F_Build_Test	1m 31s
Notification	0s
NuttX_STM32F4_Build_Test	2m 25s
RIOT_STM32F4_Build_Test	57s
Zephyr_STM32F4_Build_Test	3m 17s
	1h 19m 57s

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