RFR: 8327701: Remove the xlc toolchain [v2]

[Magnus Ihse Bursie]

On Fri, 8 Mar 2024 15:41:16 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Revert SEARCH_PATH changes
>
> make/autoconf/toolchain.m4 line 444:
> 
>> 442:   COMPILER_NAME=$2
>> 443:   SEARCH_LIST="$3"
>> 444:   SEARCH_PATH="$PATH"
> 
> I am note 100% sure about this; I think the intention of some of the old code amounted to this, but it was not entirely clear.
> 
> But, then again, I think this is a good idea, and I think we should do this on *all* platforms -- search the toolchain path before the normal path.

Hm, as I write this, it strikes me as odd that we should not do this already. And of course we do, in `TOOLCHAIN_PRE_DETECTION`, so this snippet snippet is actually redundant.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18172#discussion_r1517889315