[flang] Disable some warnings with ineluctable false positives (#167714) There are a few well-meaning warnings for some cases of the FPTR= argument to C_F_POINTER() that can be false positives, since the restrictions in the standard are dependent on the source of the CPTR= argument. Further, there is no way to alter a program to avoid these warnings, so one cannot compile a correct and conforming program with -pedantic -Werror. Disable these warnings. Fixes https://github.com/llvm/llvm-project/issues/167470.
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