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Debug Info: Support DW_AT_calling_convention on composite types.

Description

Debug Info: Support DW_AT_calling_convention on composite types.
This implements the DWARF 5 feature described at
http://www.dwarfstd.org/ShowIssue.php?issue=141215.1

This allows a consumer to understand whether a composite data type is
trivially copyable and thus should be passed by value instead of by
reference. The canonical example is being able to distinguish the
following two types:

// S is not trivially copyable because of the explicit destructor.
struct S {
   ~S() {}
};

// T is a POD type.
struct T {
  ~T() = default;
};

rdar://problem/36034993
Differential Revision: https://reviews.llvm.org/D41039

Details

Committed
adrianJan 4 2018, 5:13 PM
Differential Revision
D41039: Add support for attribute "trivial_abi"
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