RFR: 8285802: AArch64: Consistently handle offsets in MacroAssembler as 64-bit quantities [v4]

[Andrew Haley]

> In a few places we pass offsets as 32-bit ints rather than 64-bit longs, and we're not consistent about it. We shold have a clean 64-bit path for offset generation and validation.

Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:

  Windows!

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8448/files
  - new: https://git.openjdk.java.net/jdk/pull/8448/files/a9bb2df2..fc66cb9d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8448&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8448&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8448.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8448/head:pull/8448

PR: https://git.openjdk.java.net/jdk/pull/8448