[jdk11u-dev] RFR: 8235385: Crash on aarch64 JDK due to long offset

[Alexey Pavlyutkin]

Hi!

Please review "backport" of the [Wang Zhuo's patch](http://cr.openjdk.java.net/~wzhuo/BigOffsetAarch64/webrev.00/jdk13u.patch) to 11u-dev. The patch is applied with the following adaptation:

- the legitimizing overload

static void loadStore(MacroAssembler masm, mem_insn insn,
                         Register reg, int opcode,
                         Register base, int index, int size, int disp,
                         int size_in_memory);

ported from 15u-dev with slight changes
-  `aarch64_enc_strh`, `aarch64_enc_strh0`, `aarch64_enc_strw`, `aarch64_enc_strw0`, `aarch64_enc_str`, and `aarch64_enc_str0` functions updated to use new loadStore() overload

Verified (18.04.6 LTS / aarch64 ) with the reproducers JBS, 10 of 10 runs passed. Aproximately a half of runs crashed before I've applied the patch.

Regression (18.04.6 LTS / aarch64 ): hotspot_compilers

@theRealAph @AntonKozlov please take a look at that. Andrew, I could not mention Wang, if you know his login could you mention him as well. Thank you

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Commit messages:
 - 8235385: Crash on aarch64 JDK due to long offset
 - 8235385: Crash on aarch64 JDK due to long offset

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/960/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=960&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8235385
  Stats: 44 lines in 1 file changed: 38 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/960.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/960/head:pull/960

PR: https://git.openjdk.java.net/jdk11u-dev/pull/960