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517812647a
Pack the asm Call fast path metadata next to the executable pointer so the interpreter can fetch both values with one paired load. This removes several dependent shared-data loads from the hot path. Keep the executable pointer and packed metadata in separate registers through this binding so the fast path can still use the paired-load layout after any non-strict this adjustment. Lower the packed metadata flag checks correctly on x86_64 as well. Those bits now live above bit 31, so the generator uses bt for single- bit high masks and covers that path with a unit test. Add a runtime test that exercises both object and global this binding through the asm Call fast path.