RFR: JDK-8298084: Memory leak in Method::build_profiling_method_data [v2]

[Justin King]

> Resolve memory leak related to `MethodData::_extra_data_lock` in `Method::build_profiling_method_data` by defining `MethodData::release_C_heap_structures` and calling it where appropriate before deallocating `MethodData`.

Justin King has updated the pull request incrementally with one additional commit since the last revision:

  Fix memory leak by calling destructor
  
  Signed-off-by: Justin King <jcking at google.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11526/files
  - new: https://git.openjdk.org/jdk/pull/11526/files/fc35f765..fbced7d3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11526&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11526&range=00-01

  Stats: 17 lines in 3 files changed: 0 ins; 10 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/11526.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11526/head:pull/11526

PR: https://git.openjdk.org/jdk/pull/11526