[-Wunsafe-buffer-usage] Bug fix: Handles the assertion violations for code within macros When macros get expanded, the source location for the expanded code received by the Fixable gadgets is invalid. We do not want to emit fixits for macro expanded code and it currently crashes the analysis. This patch fixes the assertion violations that were introduced for handling code with such invalid locations. Reviewed by: NoQ, ziqingluo-90, jkorous Differential revision: https://reviews.llvm.org/D146450
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