add fp16 (#46)

Summary:
Pull Request resolved: #46

adding FP16 submodule as it is an XNNPACK dependency

Differential Revision: D48180546

fbshipit-source-id: 039362a171f7d67e58339a5041b961898f3ed425

Author: mcr229

.gitmodules

@@ -16,3 +16,9 @@
 [submodule "backends/xnnpack/third-party/cpuinfo"]
 	path = backends/xnnpack/third-party/cpuinfo
 	url = https://github.com/pytorch/cpuinfo.git
+[submodule "backends/xnnpack/third-party/cpuinfo"]
+	path = backends/xnnpack/third-party/cpuinfo
+	url = https://github.com/pytorch/cpuinfo.git
+[submodule "backends/xnnpack/third-party/FP16"]
+	path = backends/xnnpack/third-party/FP16
+	url = https://github.com/Maratyszcza/FP16.git

backends/xnnpack/third-party/FP16

@@ -4,3 +4,15 @@ load(":cpuinfo_defs.bzl", "define_cpuinfo_and_clog")
 define_pthreadpool()
 
 define_cpuinfo_and_clog()
+
+native.cxx_library(
+    name = "FP16",
+    raw_headers = glob([
+        "FP16/include/*.h",
+    ]),
+    public_include_directories = [
+        "FP16/include/",
+    ],
+    force_static = True,
+    visibility = ["PUBLIC"],
+)