Add HIPRTC, glorious ersatz for NVRTC (#1097)

* Add ersatz for NVRTC.

* Fix extraneous paren and use correct namespace.

* Use lowerCamelCase (yuck, yuck) consistently.

* Link against FS when building hiprtc lib.

* Correctly mark Manipulators. Fix dual compile.

* Add unit tests. Extend HIT to accept linker options.

* Make sure the HIPRTC library is installed.

* Better logging. Try to auto-detect the target.

* Stop specifying the target explicitly.

* Add missing flavour of `hipModuleLaunchKernel`.

* Program was already destroyed.

* Don't use `--genco`. Fix mangled name trimming.

* Fix HIPRTC breakage due to upstream noise.

* [dtests] Replace RUN -> TEST in hiprtc tests

Change-Id: Ie499e92dfe4e5c94634b1c2b76cf52d241bcfea3

* [hit] Set HIP_PATH to HIP_ROOT_DIR for all tests

Change-Id: Ib0ad1f99bc71c03e363e055dd508a7a4a210680a

hipamd/src/program_state.inl

@@ -66,10 +66,17 @@ class Kernel_descriptor {
     std::uint64_t kernel_object_{};
     amd_kernel_code_t const* kernel_header_{nullptr};
     std::string name_{};
+    std::vector<std::pair<std::size_t, std::size_t>> kernarg_layout_{};
 public:
     Kernel_descriptor() = default;
-    Kernel_descriptor(std::uint64_t kernel_object, const std::string& name)
-        : kernel_object_{kernel_object}, name_{name}
+    Kernel_descriptor(
+        std::uint64_t kernel_object,
+        const std::string& name,
+        std::vector<std::pair<std::size_t, std::size_t>> kernarg_layout = {})
+        :
+        kernel_object_{kernel_object},
+        name_{name},
+        kernarg_layout_{std::move(kernarg_layout)}
     {
         bool supported{false};
         std::uint16_t min_v{UINT16_MAX};
@@ -548,6 +555,7 @@ public:
         return functions[agent].second;
     }
 
+    static
     std::size_t parse_args(
             const std::string& metadata,
             std::size_t f,
@@ -576,6 +584,7 @@ public:
         } while (true);
     }
 
+    static
     void read_kernarg_metadata(
             ELFIO::elfio& reader,
             std::unordered_map<