Add initCompressionFlag() to String constructors

Set compression flag in constructors creating uncompressed strings when
compact strings is enabled. OpenJ9 uses this flag to check if a string
with uncompressed characters has been created, and not having it enabled
when there has been leads to errors since the code assumes all strings
are still compressed.

Signed-off-by: Mike Zhang <[email protected]>

Author: mikezhang1234567890

src/java.base/share/classes/java/lang/String.java

@@ -525,6 +525,7 @@ public String(int[] codePoints, int offset, int count) {
                 this.value = val;
                 return;
             }
+            initCompressionFlag();
         }
         this.coder = UTF16;
         this.value = StringUTF16.toBytes(codePoints, offset, count);
@@ -589,6 +590,9 @@ public String(byte ascii[], int hibyte, int offset, int count) {
             }
             this.value = val;
             this.coder = UTF16;
+            if (COMPACT_STRINGS) {
+                initCompressionFlag();
+            }
         }
     }
 
@@ -822,6 +826,7 @@ public String(byte[] bytes, int offset, int length, Charset charset) {
                         coder = LATIN1;
                         return;
                     }
+                    initCompressionFlag();
                 }
                 coder = UTF16;
                 value = StringUTF16.toBytes(ca, 0, clen);
@@ -851,6 +856,9 @@ public String(byte[] bytes, int offset, int length, Charset charset) {
             coder = UTF16;
             value = StringUTF16.toBytes(ca, 0, caLen);
         }
+        if (COMPACT_STRINGS && coder == UTF16) {
+            initCompressionFlag();
+        }
     }
 
     /*
@@ -5262,7 +5270,8 @@ void getBytes(byte[] dst, int srcPos, int dstBegin, byte coder, int length) {
                 this.coder = LATIN1;
                 return;
             }
-        }
+            initCompressionFlag();
+		}
         this.coder = UTF16;
         this.value = StringUTF16.toBytes(value, off, len);
     }
@@ -5285,6 +5294,7 @@ void getBytes(byte[] dst, int srcPos, int dstBegin, byte coder, int length) {
                     this.value = buf;
                     return;
                 }
+                initCompressionFlag();
             }
             this.coder = UTF16;
             this.value = Arrays.copyOfRange(val, 0, length << 1);