[llvm-commits] llvm-gcc: use component_ref_field_offset in component references

[Duncan Sands]

The third operand of a COMPONENT_REF represents the byte offset of
the field; it is accessed using component_ref_field_offset.  Most of
the time you can get away with extracting the offset from the type,
using DECL_FIELD_OFFSET, which is what is done currently, but this
can fail if DECL_FIELD_OFFSET contains a PLACEHOLDER_EXPR for example.
The NON_LVALUE_EXPR Ada testcase also tests this one.
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