Don't assume string_view::iterator is const char* #4838

Job	Run time
CheckFormatAndBuildClean	27s
ClangTidy	11m 53s
x86_64 test	5m 20s
KytheVerification	0s
arm64 test	5m 52s
KytheXrefs	0s
x86_64 test-clang	4m 49s
MacOsBuild	4m 0s
arm64 test-clang	5m 36s
PrepareVSPlugin	3m 20s
x86_64 test-nortti	5m 15s
WindowsBuild	19m 29s
x86_64 test-c++20	4m 44s
x86_64 test-c++23	4m 25s
x86_64 smoke-test	15m 22s
arm64 smoke-test	15m 38s
x86_64 asan	7m 5s
x86_64 asan-clang	5m 36s
x86_64 compile	4m 55s
arm64 compile	4m 4s
x86_64 compile-clang	3m 37s
arm64 compile-clang	4m 15s
x86_64 compile-static	3m 36s
arm64 compile-static	4m 26s
x86_64 compile-static-clang	3m 33s
arm64 compile-static-clang	4m 7s
x86_64 clean	7m 39s
arm64 clean	7m 7s
Build and deploy GitHub pages	0s
📦 Release	1s
	2h 46m 11s

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