[PATCH] D151298: [clang][LoongArch] Fix the calling convention for empty struct in C++ mode

[wanglei via Phabricator via cfe-commits]

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Prior to this patch, paramter or return value whose type was a
structure containing empty structure members and fewer than three
floating-point members did not meet the calling convention.

With this patch, an empty struct will always be passed.

An empty struct type that is not non-trivial for the purposes of calls
will be treated as though it were the following C type:

  struct {
    char c;
  };

Change-Id: If5c7f499d38d1853261dc1dae6620b8fc9db7fd3


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151298

Files:
  clang/docs/ReleaseNotes.rst
  clang/lib/CodeGen/TargetInfo.cpp
  clang/test/CodeGenCXX/LoongArch/abi-lp64d-empty-struct.cpp

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