[PATCH] AArch64: Safely handle the incoming sret call argument.

[Andrew Trick]

This adds a safe interface to the machine independent InputArg
struct for accessing the index of the original (IR-level)
argument. When a non-native return type is lowered, we generate
the hidden machine-level sret argument on-the-fly. Before this
fix, we were representing this argument as OrigArgIndex == 0,
which is an outright lie. In particular this crashed in the
AArch64 backend where we actually try to access the type of the
original argument.

Now we use a sentinel value for machine arguments that have no
original argument index. AArch64, Mips, and PPC now check for
this case before accessing the original argument.

Fixes <rdar://19792160> Null pointer assertion in AArch64TargetLowering
---
 include/llvm/Target/TargetCallingConv.h          | 11 +++++++++++
 lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp |  3 ++-
 lib/Target/AArch64/AArch64ISelLowering.cpp       | 23 ++++++++++++-----------
 lib/Target/ARM/ARMISelLowering.cpp               |  4 ++--
 lib/Target/Mips/MipsCCState.cpp                  |  4 ++--
 lib/Target/Mips/MipsISelLowering.cpp             |  7 +++++--
 lib/Target/PowerPC/PPCISelLowering.cpp           | 18 ++++++++++++------
 lib/Target/R600/R600ISelLowering.cpp             |  2 +-
 lib/Target/R600/SIISelLowering.cpp               |  6 +++---
 test/CodeGen/AArch64/implicit-sret.ll            | 13 +++++++++++++
	
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