RFR: 8266950: Remove vestigial support for non-strict floating-point execution [v6]

[David Holmes]

> As part of JEP 306, the vestiges of HotSpot support for non-strict floating-point execution can be removed. All methods implicitly have strictfp semantics so the explicit checks for is_strict() can be replaced by true and the code reformulated accordingly.
> 
> There are still some names that include "strict" that could potentially be renamed to remove it, but the fact we have to have strict fp semantics is still important on some platforms, so the names help reinforce that IMO.
> 
> Testing: tiers 1-3
> 
> Thanks,
> David

David Holmes has updated the pull request incrementally with one additional commit since the last revision:

  Remove dead code on aarch64

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3991/files
  - new: https://git.openjdk.java.net/jdk/pull/3991/files/4dcab9b7..cc526aa4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3991&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3991&range=04-05

  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3991.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3991/head:pull/3991

PR: https://git.openjdk.java.net/jdk/pull/3991