Add CFI support for assembly heavy libraries

This commit adds an new option to the sanitizer build config to enable CFI with the
"-fno-sanitize-cfi-canonical-jump-tables" flag in order to provide more
support for assembly heavy libraries.

Bug: 158010610
Test: Compile with option enabled in libaom and libvpx
Change-Id: I7d0d3ed6ff876582043fd72b687757426e3dc5aa

cc/sanitize.go

@@ -172,6 +172,12 @@ type SanitizeUserProps struct {
 		No_recover       []string
 	}
 
+	// Sanitizers to run with flag configuration specified
+	Config struct {
+		// Enables CFI support flags for assembly-heavy libraries
+		Cfi_assembly_support *bool `android:"arch_variant"`
+	}
+
 	// value to pass to -fsanitize-recover=
 	Recover []string
 
@@ -543,6 +549,9 @@ func (sanitize *sanitize) flags(ctx ModuleContext, flags Flags) Flags {
 
 		flags.Local.CFlags = append(flags.Local.CFlags, cfiCflags...)
 		flags.Local.AsFlags = append(flags.Local.AsFlags, cfiAsflags...)
+		if Bool(sanitize.Properties.Sanitize.Config.Cfi_assembly_support) {
+			flags.Local.CFlags = append(flags.Local.CFlags, "-fno-sanitize-cfi-canonical-jump-tables")
+		}
 		// Only append the default visibility flag if -fvisibility has not already been set
 		// to hidden.
 		if !inList("-fvisibility=hidden", flags.Local.CFlags) {