Merge pull request #121 from riscv-software-src/precise_raise

Make reachable exception pass look for raise_precise, too

lib/idl/passes/reachable_exceptions.rb

@@ -20,7 +20,7 @@ def reachable_exceptions(symtab)
 
   class FunctionCallExpressionAst
     def reachable_exceptions(symtab)
-      if name == "raise"
+      if name == "raise" || name == "raise_precise"
         # first argument is the exception
         code_ast = arg_nodes[0]
         value_result = value_try do