Test

Fix GH-21639: Protect frameless args during __toString() reentry #1974

Job	Run time
Generate Matrix	9s
Suite / LINUX_X64_ASAN_DEBUG_ZTS	46m 37s
Suite / LINUX_X32_DEBUG_ZTS	13m 6s
Suite / MACOS_ARM64_DEBUG_NTS	25m 59s
Suite / LINUX_X64_RELEASE_NTS	22m 29s
Suite / ALPINE_X64_ASAN_DEBUG_ZTS	32m 26s
Suite / WINDOWS_X64_ZTS	33m 52s
Suite / FREEBSD_NTS	11m 49s
Suite / BENCHMARKING	16m 22s
Suite / COVERAGE	0s
Suite / LIBMYSQLCLIENT	0s
Suite / LINUX_PPC64_ASAN_DEBUG_ZTS	0s
Suite / PECL	0s
Suite / OPCACHE_VARIATION	0s
Suite / COMMUNITY_${{ matrix.type }}	0s
Suite / SOLARIS	0s
Suite / MSAN	0s
	3h 22m 49s

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