RFR: 8253539: Remove unused JavaThread functions for set_last_Java_fp/pc

[Robbin Ehn]

On Wed, 23 Sep 2020 15:12:57 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> These functions are also unused and in the thread_platform.hpp files.  _last_Java_sp and _last_Java_fp are set in the
> assembly code for platforms that use these (x86, arm32 and aarch64).  The shared runtime code never sets these, or
> should it. last_Java_fp() is always called through JavaFrameAnchor, so that function is not needed.
> last_Java_fp_offset() is used and needs to be in these platform dependent files because not all platforms save
> last_Java_fp.  Tested with build on arm32 and tier1 on Oracle platforms including aarch64.

Marked as reviewed by rehn (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/324