Replace GCC-specific intrinsic with portable alternative.

Not all supported compilers have GCC intrinsics, so this patch
uses the correct portable alternative.

Additionally, this patch fixes an off-by-one error.  __builtin_ffs
returns the 1-based index of the least-significant 1-bit, but the
function expects the base 2 logarithm of the number, which is
equivalent to the 0-based index of the least-significant 1-bit.

Reviewed by: Keno Fischer

Differential Revision: http://reviews.llvm.org/D4284

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@211669 91177308-0d34-0410-b5e6-96231b3b80d8