[BOLT] Add GNUPropertyRewriter and warn on AArch64 BTI note (#161206) This commit adds the GNUPropertyRewriter, which parses features from the .note.gnu.property section. Currently we only read the bit indicating BTI support (GNU_PROPERTY_AARCH64_FEATURE_1_BTI). As BOLT does not add BTI landing pads to targets of indirect branches/calls, we have to emit a warning that the output binary may be corrupted.
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