RFR: 8259486: Replace PreserveExceptionMark with implementation for CautiouslyPreserveExceptionMark [v4]

[Coleen Phillimore]

> See CR for details.  This is a hopefully simple cleanup.  I didn't try to reason about removing any of these except an obvious call (if you look above the patch in thread.cpp).
> Tested with tier1-3.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  fix space

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2007/files
  - new: https://git.openjdk.java.net/jdk/pull/2007/files/7f4427c4..2c008402

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2007&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2007&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2007.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2007/head:pull/2007

PR: https://git.openjdk.java.net/jdk/pull/2007