Add support for sanitizer property

Add a new feature to cc modules that adds the cflags and libraries
necessary to implement AddressSanitizer, ThreadSanitizer, and
UndefinedBehaviorSanitizer.

Change-Id: Ibe5ffadc7ece56080a2521f2c7c00da9ef712584

common/variable.go

@@ -77,6 +77,9 @@ type productVariables struct {
 	Unbundled_build            *bool `json:",omitempty"`
 	Brillo                     *bool `json:",omitempty"`
 	Malloc_not_svelte          *bool `json:",omitempty"`
+
+	SanitizeHost   *[]string `json:",omitempty"`
+	SanitizeDevice *[]string `json:",omitempty"`
 }
 
 func boolPtr(v bool) *bool {