RFR: 8255479: [aarch64] assert(src->section_index_of(target) == CodeBuffer::SECT_NONE) failed: sanity

[Patric Hedlin]

The "byte map base" (CardTable) might be materialised as an external address but as such the current relocation support expects an address _external_ to the associated CodeBuffer. This might not be the case since "byte map base" /is not/need not be/ a proper address. Instead, the "byte map base" may be materialised as a constant, in order to avoid relocation (issues).

(If PC-relative materialisation should be used, a new RFE is suggested.)

Changing assert in "fix_relocation_after_move" to cover both target == NULL and target != NULL, for both source and destination code buffer.

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Commit messages:
 - 8255479: [aarch64] assert(src->section_index_of(target) == CodeBuffer::SECT_NONE) failed: sanity

Changes: https://git.openjdk.java.net/jdk/pull/1382/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1382&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255479
  Stats: 23 lines in 3 files changed: 1 ins; 11 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1382.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1382/head:pull/1382

PR: https://git.openjdk.java.net/jdk/pull/1382