Update benchmark suite name and version

The benchmark name defined in base.yml is simply "dacapochopin", and we
reference that in normal-heap.yml that.

We also mention the MR2 version of the DaCapo Chopin JAR file wherever
appropriate.

Author: wks

.github/configs/normal-heap.yml

@@ -14,4 +14,4 @@ configs:
 
 # This will be expanded in CI when we run with the config. Keep a new line at the end.
 benchmarks:
-  dacapo-23.9-RC3-chopin-ci:
+  dacapochopin:

.github/scripts/pgo-build.sh

@@ -17,7 +17,7 @@ RUSTFLAGS="-Cprofile-generate=/tmp/$USER/pgo-data" make CONF=linux-x86_64-server
 rm -rf /tmp/$USER/pgo-data/*
 
 # Profile using fop
-MMTK_PLAN=GenImmix MMTK_STRESS_FACTOR=4194304 MMTK_PRECISE_STRESS=false ./build/linux-x86_64-server-release/images/jdk/bin/java -XX:MetaspaceSize=500M -XX:+DisableExplicitGC -XX:-TieredCompilation -Xcomp -XX:+UseThirdPartyHeap -Xms60M -Xmx60M -jar /usr/share/benchmarks/dacapo/dacapo-23.11-chopin.jar -n 5 fop
+MMTK_PLAN=GenImmix MMTK_STRESS_FACTOR=4194304 MMTK_PRECISE_STRESS=false ./build/linux-x86_64-server-release/images/jdk/bin/java -XX:MetaspaceSize=500M -XX:+DisableExplicitGC -XX:-TieredCompilation -Xcomp -XX:+UseThirdPartyHeap -Xms60M -Xmx60M -jar /usr/share/benchmarks/dacapo/dacapo-23.11-MR2-chopin.jar -n 5 fop
 
 # Merge profiling data
 /opt/rust/toolchains/1.83.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-profdata merge -o /tmp/$USER/pgo-data/merged.profdata /tmp/$USER/pgo-data

README.md

@@ -163,7 +163,7 @@ We then run `fop` in order to get some profiling data. Note that your location
 for the DaCapo benchmarks may be different:
 
 ```bash
-MMTK_PLAN=GenImmix MMTK_STRESS_FACTOR=4194304 MMTK_PRECISE_STRESS=false ./build/linux-x86_64-server-release/images/jdk/bin/java -XX:MetaspaceSize=500M -XX:+DisableExplicitGC -XX:-TieredCompilation -Xcomp -XX:+UseThirdPartyHeap -Xms60M -Xmx60M -jar /usr/share/benchmarks/dacapo/dacapo-23.11-chopin.jar -n 5 fop
+MMTK_PLAN=GenImmix MMTK_STRESS_FACTOR=4194304 MMTK_PRECISE_STRESS=false ./build/linux-x86_64-server-release/images/jdk/bin/java -XX:MetaspaceSize=500M -XX:+DisableExplicitGC -XX:-TieredCompilation -Xcomp -XX:+UseThirdPartyHeap -Xms60M -Xmx60M -jar /usr/share/benchmarks/dacapo/dacapo-23.11-MR2-chopin.jar -n 5 fop
 ```
 
 We have to merge the profiling data into something we can feed into the Rust