Java runs out of memory during some operations during build or install.
Increase Xms memory.

--- jdk26u-jdk-26.0.2.1-ga/make/RunTestsPrebuiltSpec.gmk.old	2026-09-01 15:09:29.445659538 -0400
+++ jdk26u-jdk-26.0.2.1-ga/make/RunTestsPrebuiltSpec.gmk	2026-09-01 15:09:50.641243848 -0400
@@ -63,7 +63,7 @@
 
 # Use hard-coded values for java flags (one size, fits all!)
 JAVA_FLAGS := -Duser.language=en -Duser.country=US
-JAVA_FLAGS_BIG := -Xms64M -Xmx2048M
+JAVA_FLAGS_BIG := -Xms128M -Xmx2048M
 JAVA_FLAGS_SMALL := -XX:+UseSerialGC -Xms32M -Xmx512M -XX:TieredStopAtLevel=1
 BUILDJDK_JAVA_FLAGS_SMALL := -Xms32M -Xmx512M -XX:TieredStopAtLevel=1
 BUILD_JAVA_FLAGS := $(JAVA_FLAGS_BIG)