Avoid x87 instructions for x64 for fpclassifyl


git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6309 4407c894-4637-0410-b4f5-ada5f102cad1
Make sure we don't clobber %rax for x64 case in internal modf.


git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6310 4407c894-4637-0410-b4f5-ada5f102cad1
Avoid use of x87 instruction for x64 version of fpclassifyl


git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6311 4407c894-4637-0410-b4f5-ada5f102cad1