rust: Support MTE memtag_heap sanitizer

This CL adds support for the MTE memtag_heap sanitizer. This is
controlled via inclusion of an ELF note.

Bug: 170672854
Test: Heap MTE-enabled Rust test binary triggers MTE
Change-Id: I2619818785e86a94667d02b30d102c83456b7925

rust/test.go

@@ -196,3 +196,7 @@ func (test *testDecorator) compilerDeps(ctx DepsContext, deps Deps) Deps {
 
 	return deps
 }
+
+func (test *testDecorator) testBinary() bool {
+	return true
+}