[Bug middle-end/103950] [9/10/11/12 Regression] printf("\xff") incorrectly optimized to putchar(-1)

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103950

--- Comment #6 from Thorsten Otto <ad...@tho-otto.de> ---
A similar fix will be needed in gimple_fold_builtin_fputs