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------------------------------------------------------------------------ r229413 | atrick | 2015-02-16 13:10:47 -0500 (Mon, 16 Feb 2015) | 16 lines AArch64: Safely handle the incoming sret call argument. 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, ARM, Mips, and PPC now check for this case before accessing the original argument. Fixes <rdar://19792160> Null pointer assertion in AArch64TargetLowering ------------------------------------------------------------------------ git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_36@236856 91177308-0d34-0410-b5e6-96231b3b80d8