android: add 'Restat: true' to tblgenRule definition (llvm90)
Based on suggestion by Colin Cross, to avoid unnecessary rebuild of llvm90
in case of *.inc generated sources older than llvm90-tblgen binary.
When llvm90-tblgen binary is compiled and for some reason the build is interrupted,
the generated *.inc files will have a timestamp older than llvm90-tblgen binary,
at this point all libLLVM* targets depending on the *.inc files are always rebuilt.
'NINJA_ARGS="-d explain" make iso_img' command revealed the cause of the problem:
ninja explain: output out/soong/.intermediates/external/llvm90/llvm90-gen-attributes/gen/llvm/IR/Attributes.inc
older than most recent input out/soong/host/linux-x86/bin/llvm90-tblgen (
1570914978 vs
1575285173)
ninja explain: out/soong/.intermediates/external/llvm90/llvm90-gen-attributes/gen/llvm/IR/Attributes.inc is dirty
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>