Allow any test to be executed via a %run command.

Configure %run with COMPILER_RT_EMULATOR:

  $ cmake -DCOMPILER_RT_EMULATOR="qemu-arm -L $SYSROOT"

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@207707 91177308-0d34-0410-b5e6-96231b3b80d8
Add %run to all lit tests

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@207709 91177308-0d34-0410-b5e6-96231b3b80d8
The newest versions of CMake require outputs of custom commands be in
DEPENDS rather than SOURCES. The SOURCES just end up looking on the
filesystem and not finding anything. Makes for very hard to debug build
errors. =/

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@207722 91177308-0d34-0410-b5e6-96231b3b80d8