LLVM does not distinguish Cortex-M4 from Cortex-M4F neither Cortex-R5 from R5F.

Removed "cortex-r5f" and "cortex-m4f" from Target Parser, sinced they are
unknown cpu names for llvm and clang. Also updated default FPUs for R5 and M4
accordingly.

Differential Revision: http://reviews.llvm.org/D12692

Change-Id: Ib81c7216521a361d8ee1296e4b6a2aa00bd479c5
llvm-svn: 247136