RFR: 8253757: Add LLVM-based backend for hsdis [v2]

[Ludovic Henry]

On Wed, 30 Sep 2020 07:26:56 GMT, Xin Liu <xliu at openjdk.org> wrote:

>To disassemble code, I don't think we have to link so many libraries. It looks like code only explicitly depends
>LLVMMCDisassembler and LLVMTarget here.

This is the result of `llvm-config --libs x86 x86disassembler` and `llvm-config --libs aarch64 aarch64disassembler`.

> If we do need to link those libraries, how about we just use llvm-config --libs. If we declare so many names here, the
> Makefile is subject to LLVM. In history, LLVM refactored a lot.

That should work in the general case. I did it this way originally because of cases where we need to use a
cross-compiled LLVM. Then `llvm-config` and the related libraries would be compiled for the host platform. Then, the
user can just specify the `LIBRARIES/*` variable by hand on the command line.

> src/utils/hsdis/hsdis.cpp line 79:
> 
>> 77:
>> 78: #ifndef bool
>> 79: #define bool int
> 
> if we switch to cpp, do we still need this?

Let me remove these defines.

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PR: https://git.openjdk.java.net/jdk/pull/392