[riscv-port] RFR: 8280683: riscv: Remove uses of long and unsigned long [v2]

[Yadong Wang]

> The riscv port should follow https://bugs.openjdk.java.net/browse/JDK-8248404, for the same reason of:
> 
> In many cases the RISCV64 back end uses long and unsigned long types. These types don't work on LLP64 systems (such as Windows) and should be replaced either by int64_t or jlong, as appropriate.
> 
> 
> Hotspot/jdk tier1 passed on the unmatched board. And all jtreg tests have been tested on Qemu without new failures.

Yadong Wang has updated the pull request incrementally with one additional commit since the last revision:

  include a header file

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

Changes:
  - all: https://git.openjdk.java.net/riscv-port/pull/55/files
  - new: https://git.openjdk.java.net/riscv-port/pull/55/files/2ed5134e..621dbecc

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=55&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=55&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/riscv-port/pull/55.diff
  Fetch: git fetch https://git.openjdk.java.net/riscv-port pull/55/head:pull/55

PR: https://git.openjdk.java.net/riscv-port/pull/55