7154889: Non-zero padding is still not allowed in the tableswitch/lookupswitch instructions.

Summary: Do not check that the padding bytes are zero if class file format version >=51.
Reviewed-by: dholmes, coleenp, mullan, kvn
Contributed-by: harold.seigel@oracle.com

src/share/native/common/check_code.c

@@ -206,6 +206,8 @@ enum {
 
 #define LDC_METHOD_HANDLE_MAJOR_VERSION 51
 
+#define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
+
 #define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION  52
 
 #define ALLOC_STACK_SIZE 16 /* big enough */
@@ -1146,6 +1148,8 @@ verify_opcode_operands(context_type *context, unsigned int inumber, int offset)
         int *saved_operand;
         int keys;
         int k, delta;
+
+        if (context->major_version < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
             /* 4639449, 4647081: Padding bytes must be zero. */
             unsigned char* bptr = (unsigned char*) (code + offset + 1);
             for (; bptr < (unsigned char*)lpc; bptr++) {
@@ -1153,6 +1157,7 @@ verify_opcode_operands(context_type *context, unsigned int inumber, int offset)
                     CCerror(context, "Non zero padding bytes in switch");
                 }
             }
+        }
         if (opcode == JVM_OPC_tableswitch) {
             keys = _ck_ntohl(lpc[2]) -  _ck_ntohl(lpc[1]) + 1;
             delta = 1;