Fix a race condition diagnosed by gcc -Wsequence-point (Bug#8254).
An expression of the form (DOWNCASE (x) == DOWNCASE (y)), found in dired.c's scmp function, had undefined behavior. * lisp.h (DOWNCASE_TABLE, UPCASE_TABLE, DOWNCASE, UPPERCASEP): (NOCASEP, LOWERCASEP, UPCASE, UPCASE1): Move from here ... * buffer.h: ... to here, because these macros use current_buffer, and the new implementation with inline functions needs to have current_buffer in scope now, rather than later when the macros are used. (downcase, upcase1): New static inline functions. (DOWNCASE, UPCASE1): Reimplement using these functions. This avoids undefined behavior in expressions like DOWNCASE (x) == DOWNCASE (y), which previously suffered from race conditions in accessing the global variables case_temp1 and case_temp2. * casetab.c (case_temp1, case_temp2): Remove; no longer needed. * lisp.h (case_temp1, case_temp2): Remove their decls. * character.h (ASCII_CHAR_P): Move from here ... * lisp.h: ... to here, so that the inline functions mentioned above can use them.
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