transformations must not substitute the alloca with any intervening
value. This can be verified by the runtime simply by checking that the
stack map's location is a Direct location type.
+
+
+Supported Architectures
+=======================
+
+Support for StackMap generation and the related intrinsics requires
+some code for each backend. Today, only a subset of LLVM's backends
+are supported. The currently supported architectures are X86_64,
+PowerPC, and Aarch64.
+