Added back mozilla-1516803.patch

firefox.spec

@@ -234,6 +234,7 @@ Patch407:        mozilla-1667096.patch
 
 # PGO/LTO patches
 Patch600:        pgo.patch
+Patch602:        mozilla-1516803.patch
 Patch603:        firefox-gcc-always-inline.patch
 
 # tentative patch for RUSTFLAGS parsing issue:
@@ -507,6 +508,7 @@ This package contains results of tests executed during build.
 %if %{build_with_pgo}
 %if !%{build_with_clang}
 %patch600 -p1 -b .pgo
+%patch602 -p1 -b .1516803
 %endif
 %endif
 %patch603 -p1 -b .inline

mozilla-1516803.patch

@@ -0,0 +1,15 @@
+diff -up firefox-84.0/security/sandbox/linux/moz.build.1516803 firefox-84.0/security/sandbox/linux/moz.build
+--- firefox-84.0/security/sandbox/linux/moz.build.1516803      2020-12-10 16:17:55.425139545 +0100
++++ firefox-84.0/security/sandbox/linux/moz.build      2020-12-10 16:29:21.945860841 +0100
+@@ -114,9 +114,8 @@ if CONFIG["CC_TYPE"] in ("clang", "gcc")
+ # gcc lto likes to put the top level asm in syscall.cc in a different partition
+ # from the function using it which breaks the build.  Work around that by
+ # forcing there to be only one partition.
+-for f in CONFIG["OS_CXXFLAGS"]:
+-    if f.startswith("-flto") and CONFIG["CC_TYPE"] != "clang":
+-        LDFLAGS += ["--param lto-partitions=1"]
++if CONFIG['CC_TYPE'] != 'clang':
++    LDFLAGS += ['--param', 'lto-partitions=1']
+ 
+ DEFINES["NS_NO_XPCOM"] = True
+ DisableStlWrapping()