[riscv-port] RFR: 8278474: riscv: Enable two more jtreg hotspot tests

[Feilong Jiang]

Some jtreg tests are arch dependent, enable two more hotspot tests on riscv:
- test/hotspot/jtreg/compiler/c2/TestBit.java
- test/hotspot/jtreg/serviceability/AsyncGetCallTrace/MyPackage/ASGCTBaseTest.java

The above tests are passed on unmatched board and QEMU user mode.

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Commit messages:
- 8278474: riscv: Enable two more jtreg hotspot tests

Changes: https://git.openjdk.java.net/riscv-port/pull/27/files
Webrev: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=27&range=00
Issue: https://bugs.openjdk.java.net/browse/JDK-8278474
Stats: 4 lines in 2 files changed: 1 ins; 0 del; 3 mod
Patch: https://git.openjdk.java.net/riscv-port/pull/27.diff
Fetch: git fetch https://git.openjdk.java.net/riscv-port pull/27/head:pull/27

PR: https://git.openjdk.java.net/riscv-port/pull/27