RFR: 8278036: Saving rscratch1 is optional in MacroAssembler::verify_heapbase [v3]

[Yi-Fan Tsai]

> 8278036: Saving rscratch1 is optional in MacroAssembler::verify_heapbase

Yi-Fan Tsai has updated the pull request incrementally with one additional commit since the last revision:

  Remvoe unnecessary _LP64 checks

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7067/files
  - new: https://git.openjdk.java.net/jdk/pull/7067/files/efabb85c..3dc444b0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7067&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7067&range=01-02

  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7067.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7067/head:pull/7067

PR: https://git.openjdk.java.net/jdk/pull/7067