[5.3][build] properly install compiler-rt from Xcode toolchain #34236
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Similarly to what was done for #25547, copy the compiler-rt built-ins
for embedded platforms from the Xcode toolchain into the new generated
one, so to avoid link time errors.
Addresses SR-12001, rdar://57837918
Cherry-pick of #31247 -- this also brings in the improvements from #34049