use the "symbol" helper function in all exports
move all declarations from common.zig to compiler_rt.zig
flatten the tree structure somewhat (move contents of tiny files into
parent files)
No functional changes.
Signed-off-by: Brian Cain <bcain@quicinc.com>
Signed-off-by: Brian Cain <brian.cain@oss.qualcomm.com>
Co-authored-by: Alex Rønne Petersen <alex@alexrp.com>