RFR: 8183569: Assert the same limits are used in parse_xss and globals.hpp [v6]

[Ioi Lam]

> We have the following in Arguments::parse_xss():
> 
>   const julong min_ThreadStackSize = 0;
>   const julong max_ThreadStackSize = 1 * M;
>   const julong min_size = min_ThreadStackSize * K;
>   const julong max_size = max_ThreadStackSize * K;
> 
> which duplicates the min/max range specified in globals.hpp:
> 
>   product_pd(intx, ThreadStackSize, \
>           "Thread Stack Size (in Kbytes)") \
>           range(0, 1 * M) \
> 
> I added an API to query the min/max range of a flag, so parse_xss can be rewritten as
> 
>   const JVMTypedFlagLimit<intx>* limit = 
>     JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
>   const julong min_size = limit->min() * K;
>   const julong max_size = limit->max() * K;

Ioi Lam has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains seven additional commits since the last revision:

 - Merge branch 'master' of https://github.com/openjdk/jdk into 8183569-duplicated-flag-limits-parse-xss
 - fixed optimized build
 - @kimbarrett comments
 - use macros to simplify assert_compatible_type; restore code in parse_xss so the comments make sense
 - fixed typo
 - use type_traits to avoid lots of boiler-plate functions
 - step one

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2688/files
  - new: https://git.openjdk.java.net/jdk/pull/2688/files/e28c07cc..e0ad72f6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2688&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2688&range=04-05

  Stats: 15113 lines in 689 files changed: 8129 ins; 3848 del; 3136 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2688.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2688/head:pull/2688

PR: https://git.openjdk.java.net/jdk/pull/2688