Add risc-v support to versioner.

Also fill out some of the data we've fallen behind on, like "which API
levels actually exist".

Signed-off-by: Mao Han <han_mao@linux.alibaba.com>
Signed-off-by: Xia Lifang <lifang_xia@linux.alibaba.com>
Signed-off-by: Chen Guoyin <chenguoyin.cgy@linux.alibaba.com>
Signed-off-by: Wang Chen <wangchen20@iscas.ac.cn>
Signed-off-by: Lu Xufan <luxufan@iscas.ac.cn>
Test: treehugger
Change-Id: I1939426c4a22fea14232a7a93c768691ebb242ec
diff --git a/tools/versioner/src/DeclarationDatabase.cpp b/tools/versioner/src/DeclarationDatabase.cpp
index ec2e38d..a029c3b 100644
--- a/tools/versioner/src/DeclarationDatabase.cpp
+++ b/tools/versioner/src/DeclarationDatabase.cpp
@@ -170,6 +170,7 @@
               &arch_availability[Arch::x86].introduced } },
           { "introduced_in_64",
             { &arch_availability[Arch::arm64].introduced,
+              &arch_availability[Arch::riscv64].introduced,
               &arch_availability[Arch::x86_64].introduced } },
         };