compiler: update Fuchsia sanitizer support.

Author: devnexen

compiler/rustc_target/src/spec/targets/x86_64_unknown_fuchsia.rs

@@ -6,7 +6,8 @@ pub fn target() -> Target {
     base.plt_by_default = false;
     base.max_atomic_width = Some(64);
     base.stack_probes = StackProbeType::Inline;
-    base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::CFI;
+    base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::CFI | SanitizerSet::LEAK;
+    base.supports_xray = true;
 
     Target {
         llvm_target: "x86_64-unknown-fuchsia".into(),