Set default load address for launchers on s390x

Sets the load address of the launchers to 0x60000 on zlinux 64 systems. This enables compressed references with shift 0 for big heap sizes between 2040m and 4000m

Signed-off-by: Morgan Davies <morgan.davies@ibm.com>

jdk/make/CompileLaunchers.gmk

@@ -93,6 +93,16 @@ define SetupLauncher
   endif
 
   $1_LDFLAGS := $3
+
+  ifeq ($(OPENJDK_TARGET_OS), linux)
+  # Set the image base address for zLinux 64 to 0x60000 for launchers,
+  # allows compressedRefsShift to be 0 when -Xmx is set to 2040m or more.
+  # / RTC PR 100052
+    ifeq ($(OPENJDK_TARGET_CPU), s390x)
+      $1_LDFLAGS += -Wl,-Ttext-segment=0x60000
+    endif
+  endif
+
   $1_LDFLAGS_SUFFIX :=
   ifeq ($(OPENJDK_TARGET_OS), macosx)
     $1_PLIST_FILE := Info-cmdline.plist