Remove experimental pass manager for fuzzer builds.

Sanitizer coverage is currently broken with the experimental pass
manager. See b/133876586 for more information. The patch is currently
being worked on upstream (https://reviews.llvm.org/D62888), but is not
ready yet. Hence, we disable it here (similar to the LTO bug).

Bug: 133876586
Test: Build anything with SANITIZE_TARGET='fuzzer', verify that it has
'sancov' symbols.

Change-Id: I4302a8cf05300015aaff137f40b61d5685dc3fea
diff --git a/cc/sanitize.go b/cc/sanitize.go
index fdda7be..d594cc7 100644
--- a/cc/sanitize.go
+++ b/cc/sanitize.go
@@ -467,6 +467,10 @@
 		// TODO(b/131771163): LTO and Fuzzer support is mutually incompatible.
 		_, flags.LdFlags = removeFromList("-flto", flags.LdFlags)
 		flags.LdFlags = append(flags.LdFlags, "-fno-lto")
+
+		// TODO(b/133876586): Experimental PM breaks sanitizer coverage.
+		_, flags.CFlags = removeFromList("-fexperimental-new-pass-manager", flags.CFlags)
+		flags.CFlags = append(flags.CFlags, "-fno-experimental-new-pass-manager")
 	}
 
 	if Bool(sanitize.Properties.Sanitize.Cfi) {