compiler: improve comments JVMCIVersionCheck.Version#parse

Author: zapster

compiler/src/jdk.graal.compiler/src/jdk/graal/compiler/hotspot/JVMCIVersionCheck.java

@@ -113,14 +113,14 @@ static Version parse(String vmVersion) {
                     }
 
                 } catch (NumberFormatException e) {
-                    // ignore
+                    // cannot parse JVMCI version numbers -> be on the safe side and ignore
                 }
             } else {
                 try {
                     // assume OpenJDK version
                     return createOpenJDKVersion(stripVersion(vmVersion));
                 } catch (IllegalArgumentException e) {
-                    // ignore
+                    // unexpected version string -> be on the safe side and ignore
                 }
             }
             return null;