[PATCH] D125183: Add opaque pointers to the llvm-c API

[Nicolas Abram via Phabricator via llvm-commits]

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This is based on https://reviews.llvm.org/D125168 which adds a wrapper to allow use of opaque pointers from the C API.

I added an opaque pointer mode test to echo.ll , and to fix assertions that forbid the use of mixed typed and opaque pointers that were triggering in it I had to also add wrappers for setOpaquePointers and supportsTypedPointers.

I also changed echo.ll to remove a `bitcast i32* %x to i8*`, because passing it through llvm-as and llvm-dis was generating a `%0 = bitcast ptr %x to ptr`, but when building that same bitcast in echo.cpp it was getting elided by IRBuilderBase::CreateCast (https://github.com/llvm/llvm-project/blob/08ac66124874d70dab63c731da0244f9e29ef168/llvm/include/llvm/IR/IRBuilder.h#L1998-L1999).

cc @lerno


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125183

Files:
  llvm/include/llvm-c/Core.h
  llvm/lib/IR/Core.cpp
  llvm/test/Bindings/llvm-c/echo.bc
  llvm/test/Bindings/llvm-c/echo.ll
  llvm/tools/llvm-c-test/echo.cpp
  llvm/tools/llvm-c-test/llvm-c-test.h
  llvm/tools/llvm-c-test/main.c

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