dmp authored Dec 07, 2011 and Simon Marlow committed Dec 19, 2011

This commit swaps the import order of Rts.h and Stg.h in
StgCRun.c for non-SPARC architectures. Swapping the import
order prevents the declaration of the global registers thus
allowing the GHC runtime to be compiled by LLVM-based C
compilers.

LLVM-base C compilers cannot use the global register
declarations (for R1, R2, etc.) because they use
GCC-specific extensions. The declarations are not needed in
StgCRun.c except for the SPARC architecture. The other
architectures use hand-written assembly that accesses the
appropriate register directly.