Merge pull request #7564 from knn-k/aarch64build22

AArch64: Update Build Instructions

doc/build-instructions/Build_Instructions_V11.md

@@ -652,8 +652,6 @@ JCL      - 9da99f8b97 based on jdk-11+28)
 
 ## AArch64
 
-:construction: This section is still under construction.
-
 :penguin:
 The following instructions guide you through the process of building an **OpenJDK V11** binary that contains Eclipse OpenJ9 for AArch64 (ARMv8 64-bit) Linux.
 
@@ -730,7 +728,7 @@ bash configure --openjdk-target=${OPENJ9_CC_PREFIX} \
                --disable-warnings-as-errors
 ```
 
-:pencil: **Non-compressed references support:** If you require a heap size greater than 57GB, enable a noncompressedrefs build with the `--with-noncompressedrefs` option during this step.
+:pencil: **Non-compressed references support:** If you require a heap size greater than 57GB, enable a noncompressedrefs build with the `--with-noncompressedrefs` option during this step.  You need this option to use the JIT compiler regardless of heap size: the JIT does not support compressed references yet.
 
 :pencil: **OpenSSL support:** If you want to build an OpenJDK that uses OpenSSL, you must specify `--with-openssl={system|path_to_library}`
 
@@ -764,21 +762,21 @@ cd jdk
 ```
 Run:
 ```
-bin/java -Xint -version
+bin/java -version
 ```
 
 Here is some sample output:
 
 ```
-openjdk version "11.0.2-internal" 2019-01-15
-OpenJDK Runtime Environment (build 11.0.2-internal+0-adhoc..openj9-openjdk-jdk11)
-Eclipse OpenJ9 VM (build master-03a061a, JRE 11 Linux aarch64-64-Bit 20190208_000000 (JIT disabled, AOT disabled)
-OpenJ9   - 03a061a
-OMR      - a8ca0e6
-JCL      - fd5cc89 based on jdk-11.0.2+7)
+openjdk version "11.0.6-internal" 2020-01-14
+OpenJDK Runtime Environment (build 11.0.6-internal+0-adhoc..openj9-openjdk-jdk11)
+Eclipse OpenJ9 VM (build master-83baf0b, JRE 11 Linux aarch64-64-Bit 20191204_000000 (JIT enabled, AOT enabled)
+OpenJ9   - 83baf0b
+OMR      - 7b2e5df
+JCL      - d247952 based on jdk-11.0.6+6)
 ```
 
-:pencil: The JIT compiler for AArch64 is not supported at the time of writing this.  If you don't disable the JIT compiler with the `-Xint` option, you will see a warning for `libj9jit29.so`.
+:construction: AArch64 JIT compiler is not fully optimized at the time of writing this, compared with other platforms.
 
 :pencil: **OpenSSL support:** If you built an OpenJDK with OpenJ9 that includes OpenSSL v1.1.x support, the following acknowledgements apply in accordance with the license terms: