RFR: 8263649: AArch64: update cas.m4 to match current AD file [v2]

[Andrew Haley]

On Mon, 22 Mar 2021 06:39:57 GMT, Nick Gasson <ngasson at openjdk.org> wrote:

>> There's a block of code in aarch64.ad that was generated from cas.m4 and
>> is surrounded by:
>> 
>>   // BEGIN This section of the file is automatically generated. Do not edit --------------
>> 
>> However this section has been modified several times since it was
>> generated and no longer matches the output of the M4 file. This patch
>> updates cas.m4 to reflect the current code.
>
> Nick Gasson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add warning

src/hotspot/cpu/aarch64/aarch64.ad line 9315:

> 9313: 
> 9314: // This encoding class is generated automatically from cas.m4.
> 9315: // DO NOT EDIT ANYTHING IN THIS SECTION OF THE FILE

I didn't mean "exactly like". This is a pattern, not an encoding class. Sorry. :-)

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PR: https://git.openjdk.java.net/jdk/pull/3045