RFR: 8241502: C2: Migrate x86_64.ad to MacroAssembler [v8]

[Vladimir Kozlov]

On Thu, 22 Apr 2021 22:05:44 GMT, John Tortugo <github.com+2249648+JohnTortugo at openjdk.org> wrote:

>> Relates to: https://bugs.openjdk.java.net/browse/JDK-8241502
>> Tested on: Linux tier1, 2 and 3
>> 
>> Can you please take a look whether these changes are going in the direction expected or not? If it is, I'll continue working on the `JDK-8241502` but I'd like to split it in a few PRs since it's a lot of changes.
>
> John Tortugo has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix cast of constant

I got a lot of failures on Windows only. Almost all test/hotspot/jtreg/serviceability/sa/ tests failed and others.
Examples:

serviceability/sa/TestSysProps.java

#  Internal Error (t:\\workspace\\open\\src\\hotspot\\share\\runtime\\stackValue.cpp:139), pid=7572, tid=26052
#  assert(oopDesc::is_oop_or_null(val, false)) failed: bad oop found

compiler/c2/Test6800154.java
java.lang.InternalError: 9223372036854775807 / -9223372036854775808 failed: 65547 != 0
	at compiler.c2.Test6800154.run(Test6800154.java:111)
	at compiler.c2.Test6800154.main(Test6800154.java:97)

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PR: https://git.openjdk.java.net/jdk/pull/2420