[Bug target/60604] [4.9 Regression] GCC incorrectly compiles s_csinh function on MIPS32 (32bit fp)

[rsandifo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60604

--- Comment #9 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
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Created attachment 32491
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32491&action=edit
Tentative patch