Add LinuxBionic toolchain and switch

This adds a toolchain definition for LinuxBionic that only supports
Clang/64-bit. It pulls pieces from the x86_linux_host and x86_64_device
configs, and uses the android clang triple, with some manual overrides.

To enable building this, set your soong.config file to:

 {"Host_bionic": true}

Bug: 31559095
Test: out/soong/{Android,make-vars}-aosp_arm64.mk the same with or
      without host bionic turned on
Test: No change to out/soong/build.ninja before/after this change
Change-Id: Id97dda8bd9aa670c32aed31fbe6aaa8175e70b59

Android.bp

@@ -95,6 +95,7 @@ bootstrap_go_package {
 
         "cc/config/x86_darwin_host.go",
         "cc/config/x86_linux_host.go",
+        "cc/config/x86_linux_bionic_host.go",
         "cc/config/x86_windows_host.go",
     ],
     testSrcs: [