RFR: 8261710: SA DSO objects have sizes that are too large

[Yasumasa Suenaga]

This PR relates to [JDK-8261702](https://bugs.openjdk.java.net/browse/JDK-8261702) ( #2562 )
When SA creates a DSO object, which is used to represent a shared object file (.so), it initializes the "size" to be the size of the shared object file. This usually results in the size being too big. This can cause SA to get confused about whether or not an address is in the shared object. SA should instead set the DSO's size to the amount of the file that is actually mapped for executable code.

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Commit messages:
 - Use entire of address range of shared library
 - 8261710: SA DSO objects have sizes that are too large

Changes: https://git.openjdk.java.net/jdk/pull/2563/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2563&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261710
  Stats: 49 lines in 5 files changed: 27 ins; 3 del; 19 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2563.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2563/head:pull/2563

PR: https://git.openjdk.java.net/jdk/pull/2563