Summary: Back out `java.lang.StringCoding` changes delivered in JDK-8361842, which causes regressions reported here.

When `generate_string_range_check` calls in `LibraryCallKit::inline_string_copy` are migrated from C++ (`library_call.cpp`) to Java (`StringUTF16.java`), `TestStringConstruction` causes a C2 crash on Linux and Windows x64 debug builds:

```
CompileCommand: inline java/lang/String.* bool inline = true
CompileCommand: inline java/lang/StringUTF16.* bool inline = true
CompileCommand: exclude java/lang/String.checkBoundsOffCount bool exclude = true
Default case invoked for:
   opcode = 121, "Con"
  o1 Con === o0 [[ ]] #top

--N: o1 Con === o0 [[ ]] #top

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/vy/oracle/jdk~1/open/src/hotspot/share/opto/matcher.cpp:1640), pid=236333, tid=236359
# assert(false) failed: bad AD file
#
# JRE version: Java(TM) SE Runtime Environment (27.0) (fastdebug build 27-internal-vy.open)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 27-internal-vy.open, mixed mode, sharing, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x148e399] Matcher::Label_Root(Node const*, State*, Node*, Node*&)+0x5b3
```

### Reproduction

Apply the following patch:

```
diff --git a/src/hotspot/share/opto/library_call.cpp b/src/hotspot/share/opto/library_call.cpp
index a057f66a989..f95bb27bc75 100644
--- a/src/hotspot/share/opto/library_call.cpp
+++ b/src/hotspot/share/opto/library_call.cpp
@@ -1490,7 +1490,6 @@ bool LibraryCallKit::inline_string_copy(bool compress) {
   }
 
   // Range checks
- generate_string_range_check(src, src_offset, length, convert_src);
   generate_string_range_check(dst, dst_offset, length, convert_dst);
   if (stopped()) {
     return true;
diff --git a/src/java.base/share/classes/java/lang/StringUTF16.java b/src/java.base/share/classes/java/lang/StringUTF16.java
index 75c9e8239ba..288495a5c11 100644
--- a/src/java.base/share/classes/java/lang/StringUTF16.java
+++ b/src/java.base/share/classes/java/lang/StringUTF16.java
@@ -220,6 +220,7 @@ static byte coderFromArrayLen(byte[] value, int len) {
      */
     @ForceInline
     static byte[] compress(final char[] val, final int off, final int count) {
+ String.checkBoundsOffCount(off, count, val.length);
         byte[] latin1 = new byte[count];
         int ndx = compress(val, off, latin1, 0, count);
         if (ndx != count) {
```

Run `TestStringConstruction`:

```
CONF=linux-x64-debug make clean run-test TEST=open/test/hotspot/jtreg/compiler/intrinsics/string/TestStringConstruction.java JTREG="JAVA_OPTIONS=-XX:CompileThreshold=100 -XX:+UnlockExperimentalVMOptions -XX:-TieredCompilation"
```