Driver: hoist `-mlimit-float-precision` (NFC)

Move the floating point argument handling into the RenderFloatingPointOptions
helper.  This relocation just puts the floating point related options into a
single location.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@342512 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed