BytecodeAnalysisIndex: use faster hashes; encode key in 12 bytes instead of 14

Bytes per class in integration test reduced from 2083 to 1900

GitOrigin-RevId: 1c0e84b6c70869283e9db48b718e44e78dc3c554

java/java-tests/testData/codeInspection/bytecodeAnalysis/data/src/data/TestHashCollision.java

@@ -1,12 +1,12 @@
 package bytecodeAnalysis.data;
 
 public final class TestHashCollision {
-  // signature hashes for these two methods collide: MD5("()V"+"test11044") and MD5("()V"+"test20917") have the same prefix: 3d802c48
-  void test11044() {
+  // signature hashes for these two methods collide (see HMember implementation: murmur hash is used)
+  void test4691() {
     // Though purity can be inferred for this method, due to collision we erase inference result
   }
 
-  void test20917() {
+  void test184537() {
     System.out.println("non-pure");
   }
 }