Fixing sign extension in makeLibCall for MIPS64. In MIPS64 architecture all
32 bit arguments (int, unsigned int, float 32 (soft float)) must be sign
extended. This fixes test "MultiSource/Applications/oggenc/".
Patch by Strahinja Petrovic.
Differential Revision: http://reviews.llvm.org/D7791
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232943 91177308-0d34-0410-b5e6-96231b3b80d8