[libc++] Avoid spuriously unsupporting the new FTM tests (#142024) The new FTM tests contain text that they validate against to check the output of the FTM generation script. However, that text lexically contains the characters `// UNSUPPORTED: <...>`, which leads Lit to make the whole test unsupported under these conditions. To prevent that from happening, an `# END.` block can be used to prevent Lit from looking further into the file for directives.
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