Fix build warning.

LLVM_AS here doesn't generate .d files.
This fixes nonfatal build warnings like:
cp: cannot stat
'out/target/product/flounder/obj/SHARED_LIBRARIES/libclcore.bc_intermediates/ll64/math.d':
No such file or directory

Change-Id: If132999d22be0daef4ca43fdb6602dc4465cf62a
1 file changed