[EagerAppCDS] fix strlen usage (warnings: conversion from 'size_t' to…

… 'int')

Summary: conversion from 'size_t' to 'int', possible loss of data

Test Plan: windows build

Reviewed-by: lei.yul, lingjun-cg

Issue: #559

CR:

hotspot/src/share/vm/classfile/sharedClassUtil.cpp

@@ -151,9 +151,9 @@ ClassPathSegment* SharedPathsMiscInfoExt::to_sorted_segments(const char* path, i
   }
   ClassPathSegment *cps = NEW_RESOURCE_ARRAY(ClassPathSegment, max_seg_num + 1);
 
-  int len = strlen(path);
+  size_t len = strlen(path);
   //not use i < len,but use i<= len for processing the last segment conveniently
-  for (int i = 0, j = 0; i <= len; i++) {
+  for (uint i = 0, j = 0; i <= len; i++) {
     if (i == len || path[i] == os::path_separator()[0]) {
       //i == j mean a empty string
       if (i != j) {

hotspot/src/share/vm/classfile/sharedPathsMiscInfo.cpp

@@ -113,13 +113,13 @@ bool SharedPathsMiscInfo::check(jint type, const char* path) {
   case BOOT:
     if (strcmp(path, Arguments::get_sysclasspath()) != 0) {
       char* sys_cp = Arguments::get_sysclasspath();
-      int path_len = strlen(path);
-      int sys_cp_len = strlen(sys_cp);
+      size_t path_len = strlen(path);
+      size_t sys_cp_len = strlen(sys_cp);
       if(path_len >= sys_cp_len || strncmp(path, sys_cp, path_len) != 0 || !EagerAppCDS || !CDSIgnoreBootClasspathAppend) {
         return fail("[BOOT classpath mismatch, actual: -Dsun.boot.class.path=", sys_cp);
       } else {
-        int start = path_len;
-        int end = start + 1;
+        uint start = path_len;
+        uint end = start + 1;
         while(end <= sys_cp_len) {
           if(end == sys_cp_len || sys_cp[end] == os::path_separator()[0]) {
             if (!SharedClassUtil::is_appended_boot_cp(sys_cp + start + 1, end - start - 1)) {