Don't assume string_view::iterator is const char* #4844

Job	Run time
CheckFormatAndBuildClean	1m 51s
ClangTidy	17m 10s
KytheVerification	0s
KytheXrefs	0s
x86_64 test	13m 36s
MacOsBuild	10m 32s
PrepareVSPlugin	2m 5s
WindowsBuild	27m 10s
arm64 test	11m 40s
x86_64 test-clang	12m 59s
arm64 test-clang	11m 46s
x86_64 test-nortti	13m 37s
x86_64 test-c++20	15m 30s
x86_64 test-c++23	16m 11s
x86_64 smoke-test	15m 23s
arm64 smoke-test	15m 46s
x86_64 asan	17m 41s
x86_64 asan-clang	12m 49s
x86_64 compile	9m 54s
arm64 compile	6m 57s
x86_64 compile-clang	7m 9s
arm64 compile-clang	6m 56s
x86_64 compile-static	7m 43s
arm64 compile-static	7m 12s
x86_64 compile-static-clang	7m 12s
arm64 compile-static-clang	7m 11s
x86_64 clean	7m 12s
arm64 clean	7m 17s
Build and deploy GitHub pages	0s
📦 Release	1s
	4h 50m 30s

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