flang-aarch64: Refine the number of parallel jobs

Differential Revision: https://reviews.llvm.org/D89030
diff --git a/buildbot/osuosl/master/config/slaves.py b/buildbot/osuosl/master/config/slaves.py
index 49be049..5f66502 100644
--- a/buildbot/osuosl/master/config/slaves.py
+++ b/buildbot/osuosl/master/config/slaves.py
@@ -212,8 +212,8 @@
         create_slave("polly-x86_64-fdcserver", properties={'jobs': 8, 'loadaverage': 8}, max_builds=1),
 
         create_slave("flang-aarch64-ubuntu-build"),
-        create_slave("flang-aarch64-ubuntu-clang-build", properties={'jobs': 16}),
-        create_slave("flang-aarch64-ubuntu-gcc10-build", properties={'jobs': 8}),
+        create_slave("flang-aarch64-ubuntu-clang-build", properties={'jobs': 14}),
+        create_slave("flang-aarch64-ubuntu-gcc10-build", properties={'jobs': 14}),
         create_slave("nersc-flang"),
 
         # ML-Driven Compiler Optimizations build slave (Ubuntu x86_64)