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diff -up firefox-55.0/js/src/old-configure.in.rhbz-1219542-s390 firefox-55.0/js/src/old-configure.in
--- firefox-55.0/js/src/old-configure.in.rhbz-1219542-s390	2017-07-31 18:20:48.000000000 +0200
+++ firefox-55.0/js/src/old-configure.in	2017-08-02 14:31:32.190243669 +0200
@@ -541,7 +541,7 @@ case "$host" in
 
 *-linux*|*-kfreebsd*-gnu|*-gnu*)
     HOST_CFLAGS="$HOST_CFLAGS -DXP_UNIX"
-    HOST_OPTIMIZE_FLAGS="${HOST_OPTIMIZE_FLAGS=-O3}"
+    HOST_OPTIMIZE_FLAGS="${HOST_OPTIMIZE_FLAGS=-O1}"
     ;;
 
 *)
@@ -617,8 +617,8 @@ case "$target" in
 
 *-*linux*)
     if test "$GNU_CC" -o "$GNU_CXX"; then
-        MOZ_PGO_OPTIMIZE_FLAGS="-O3"
-        MOZ_OPTIMIZE_FLAGS="-O3"
+        MOZ_PGO_OPTIMIZE_FLAGS="-O1"
+        MOZ_OPTIMIZE_FLAGS="-O1"
         if test -z "$CLANG_CC"; then
            MOZ_OPTIMIZE_FLAGS="-freorder-blocks $MOZ_OPTIMIZE_FLAGS"
         fi