https://bugs.gentoo.org/730692

From 8d5318ea079f53149ab87974a4ad9ed9c5c7fcf5 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Fri, 27 Aug 2021 03:58:34 +0100
Subject: [PATCH] Drop flags Clang doesn't support

In particular, -fno-crossjumping but the rest seem rather unnecessary.
--- a/Makefile
+++ b/Makefile
@@ -130,12 +130,10 @@ $(PROG): $(OBJS)
 
 vm1.s: vm1.cpp
 	$(CXX) $(CXXFLAGS) $(CPPFLAGS) \
-	-fno-reorder-blocks -fno-crossjumping -fno-align-labels -fno-align-loops -fno-align-jumps \
 	-fverbose-asm -S src/vm1.cpp
 
 vm1.o: vm1.cpp
 	$(CXX) $(CXXFLAGS) $(CPPFLAGS) \
-	-fno-reorder-blocks -fno-crossjumping -fno-align-labels -fno-align-loops -fno-align-jumps \
 	-c src/vm1.cpp
 
 install: all stdlib sitelib