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CC_Mips doesn't accept vararg functions for O32, so we have to explicitly use CC_Mips_FixedArg. For lowerCall we now properly figure out whether callee function is vararg or not, this has no effect for O32 since we always use CC_Mips_FixedArg. For lower formal arguments we need to copy arguments in register to stack and save pointer to start for argument list into MipsMachineFunction object so that G_VASTART could use it during instruction select. For vacopy we need to copy content from one vreg to another, load and store are used for that purpose. Differential Revision: https://reviews.llvm.org/D67756 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@372555 91177308-0d34-0410-b5e6-96231b3b80d8