[PATCH] [mips] For N32/N64, structs must be passed in the upper bits of a register.

[Daniel Sanders]

Hi vmedic,

Most structs were fixed by r218451 but those of between >32-bits and
<64-bits remained broken since they were not marked with [ASZ]ExtUpper.
This patch fixes the remaining cases by using
CCPromoteToUpperBitsInType<i64> on i64's in addition to i32 and smaller.

http://reviews.llvm.org/D5963

Files:
  lib/Target/Mips/MipsCallingConv.td
  test/CodeGen/Mips/cconv/return-struct.ll
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