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llvm-toolchain-3.8 on lower arm targets, specifically Debian armel and Raspbian.

llvm-toolchain-3.8 seems to have problems on debian armel and raspbian.
On raspbian it builds but our armv7 contamination checker blocked it from entering the repo. Further investigation showed that "compiler-rt" was being built with -march=armv7 . I was able to remove the -march with some build-system hacker but then I got a failure on 
projects/compiler-rt/lib/builtins/arm/sync_fetch_and_add_4.S
[ 8%] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/sync_fetch_and_add_4.S.o cd /llvm-toolchain-3.8-3.8/build-llvm/projects/compiler-rt/lib/builtins && /usr/bin/gcc-5 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/llvm-toolchain-3.8-3.8/build-llvm/projects/compiler-rt/lib/builtins -I/llvm-toolchain-3.8-3.8/projects/compiler-rt/lib/builtins -I/llvm-toolchain-3.8-3.8/build-llvm/include -I/llvm-toolchain-3.8-3.8/include -fPIC -O2 -g -DNDEBUG -mfloat-abi=hard -o CMakeFiles/clang_rt.builtins-armhf.dir/arm/sync_fetch_and_add_4.S.o -c /llvm-toolchain-3.8-3.8/projects/compiler-rt/lib/builtins/arm/sync_fetch_and_add_4.S /llvm-toolchain-3.8-3.8/projects/compiler-rt/lib/builtins/arm/sync_fetch_and_add_4.S: Assembler messages: /llvm-toolchain-3.8-3.8/projects/compiler-rt/lib/builtins/arm/sync_fetch_and_add_4.S:20: Error: selected processor does not support `dmb' in Thumb mode /llvm-toolchain-3.8-3.8/projects/compiler-rt/lib/builtins/arm/sync_fetch_and_add_4.S:20: Error: selected processor does not support `ldrex r0,[r12]' in Thumb mode /llvm-toolchain-3.8-3.8/projects/compiler-rt/lib/builtins/arm/sync_fetch_and_add_4.S:20: Error: cannot honor width suffix -- `add r2,r0,r1' /llvm-toolchain-3.8-3.8/projects/compiler-rt/lib/builtins/arm/sync_fetch_and_add_4.S:20: Error: selected processor does not support `strex r3,r2,[r12]' in Thumb mode /llvm-toolchain-3.8-3.8/projects/compiler-rt/lib/builtins/arm/sync_fetch_and_add_4.S:20: Error: selected processor does not support `dmb' in Thumb mode projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/build.make:1097: recipe for target 'projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/sync_fetch_and_add_4.S.o' failed make[4]: *** [projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/sync_fetch_and_add_4.S.o] Error 1 
make[4]: Leaving directory '/llvm-toolchain-3.8-3.8/build-llvm'
CMakeFiles/Makefile2:12146: recipe for target 'projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/all' failed make[3]: *** [projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/all] Error 2 
make[3]: *** Waiting for unfinished jobs...
I traced this back to code in compiler-rt/lib/builtins/arm/sync-ops.h . The comments talk about both arm mode and thumb2 mode code but I only actually see thumb2 code in the file. I'm kinda stuck here.
I expect this would be a problem for armel too (though it may go unnoticed due to the fact the armel autobuilders now run on armv7 hardware and afaict Debian armel unlike raspbian doesn't have any contamination checking in place) but the build doesn't even get that far. It fails earlier with. 


/«PKGBUILDDIR»/include/llvm/Support/ThreadPool.h: In member function 'std::shared_future<void>  llvm::ThreadPool::async(Function&&, Args&&  ...)':
/«PKGBUILDDIR»/include/llvm/Support/ThreadPool.h:77:77: error: return type 'class std::shared_future<void>' is incomplete
    inline std::shared_future<VoidTy>  async(Function&&F, Args&&... ArgList) {
                                                                              ^
/«PKGBUILDDIR»/include/llvm/Support/ThreadPool.h: In member function 'std::shared_future<void>  llvm::ThreadPool::async(Function&&)':
/«PKGBUILDDIR»/include/llvm/Support/ThreadPool.h:95:57: error: return type 'class std::shared_future<void>' is incomplete
    inline std::shared_future<VoidTy>  async(Function&&F) {
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