Disable LTO and CFI for riscv64

This reverts commit 24870216e9.

Reason for revert: b/282584808

Change-Id: I3808121b4437fdd01db5d305d8f0377e6ad7bd9e

cc/lto.go

@@ -91,6 +91,11 @@ func (lto *lto) flags(ctx BaseModuleContext, flags Flags) Flags {
 		return flags
 	}
 
+	// TODO(b/254713216): LTO doesn't work on riscv64 yet.
+	if ctx.Arch().ArchType == android.Riscv64 {
+		return flags
+	}
+
 	if lto.LTO(ctx) {
 		var ltoCFlag string
 		var ltoLdFlag string

cc/sanitize.go

@@ -653,6 +653,12 @@ func (sanitize *sanitize) begin(ctx BaseModuleContext) {
 		s.Integer_overflow = nil
 	}
 
+	// TODO(b/254713216): CFI doesn't work for riscv64 yet because LTO doesn't work.
+	if ctx.Arch().ArchType == android.Riscv64 {
+		s.Cfi = nil
+		s.Diag.Cfi = nil
+	}
+
 	// Disable CFI for musl
 	if ctx.toolchain().Musl() {
 		s.Cfi = nil