Jean Perier 8dea00f4e7 [flang] Add hlfir.concat operation definition ...

This operation represents scalar character concatenation. This is
added as part of flang lowering update described in
https://github.com/llvm/llvm-project/blob/main/flang/docs/HighLevelFIR.md

A notable difference with Fortran concatenation is that hlfir.concat can
take two or more operands. This will be used to optimize concatenation
chains.

Differential Revision: https://reviews.llvm.org/D138650

2022-11-25 09:34:15 +01:00

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