Revert "Move coroutine passes from Makefile to compiler itself"

This reverts commit d9ca5f97fb.

There is a problem with coroutines that I haven't solved yet. Reverting
makes it work, for now.

Also, use a better coroutines flag for the LLVM opt tool.

Makefile

@@ -90,13 +90,13 @@ build/tgo: *.go
 	go build -o build/tgo -i .
 
 # Build IR with the Go compiler.
-build/%.o: src/examples/% src/examples/%/*.go build/tgo src/runtime/*.go build/runtime-$(TARGET)-combined.bc
+build/%.bc: src/examples/% src/examples/%/*.go build/tgo src/runtime/*.go build/runtime-$(TARGET)-combined.bc
 	./build/tgo $(TGOFLAGS) -runtime build/runtime-$(TARGET)-combined.bc -o $@ $(subst src/,,$<)
 
 # Compile and optimize bitcode file.
-#build/%.o: build/%.bc
-#	$(OPT) -coro-early -coro-split -coro-elide -Os -coro-cleanup -o $< $<
-#	$(LLC) -filetype=obj -o $@ $<
+build/%.o: build/%.bc
+	$(OPT) -Os -enable-coroutines -o $< $<
+	$(LLC) -filetype=obj -o $@ $<
 
 # Compile C sources for the runtime.
 build/%.bc: src/runtime/%.c src/runtime/*.h

compiler.go

@@ -1746,12 +1746,8 @@ func (c *Compiler) Optimize(optLevel, sizeLevel int) {
 	builder.PopulateFunc(funcPasses)
 
 	modPasses := llvm.NewPassManager()
-	modPasses.AddCoroEarlyPass()
-	modPasses.AddCoroSplitPass()
-	modPasses.AddCoroElidePass()
 	defer modPasses.Dispose()
 	builder.Populate(modPasses)
-	modPasses.AddCoroCleanupPass()
 
 	modPasses.Run(c.mod)
 }

main.go

@@ -55,7 +55,7 @@ func Compile(pkgName, runtimePath, outpath, target string, printIR, dumpSSA bool
 	if err := c.Verify(); err != nil {
 		return err
 	}
-	c.Optimize(2, 1) // -O2 -Os
+	//c.Optimize(2, 1) // -O2 -Os
 	if err := c.Verify(); err != nil {
 		return err
 	}