Add PGO support to soong

Bug: http://b/63768402
Bug: http://b/65598278

Add support for the 'pgo' property to specify how a module is processed
under PGO.  A sample property is below:

pgo: {
    instrumentation: true, // could be "sampling: true" when supported
    profile_file: "pgo_simple.profdata",
    benchmarks: ["pgo_simple"],
}

1. Runtime profiles can be gathered using "sampling" or
"instrumentation".  Sampling is not supported initially.

2. If 'toolchain/pgo-profiles' project is found,
'toolchain/pgo-profiles/${profile_file}' is passed to the compiler and
linker when building this module.

3. If ANDROID_PGO_INSTRUMENT environment variable is set, and includes a
benchmark in the 'benchmarks' list, appropriate flags (for e.g.
-fprofile-generate for instrumentation) are passed to the compiler and
linker when building this module.

Test: Add example modules that specify the pgo property and verify
appropriate flags and dependencies in the Ninja file.  Some
tests/examples are in https://android-review.googlesource.com/474805

Change-Id: I6242e0c904497a115e367dea6927ba1c4b906355

cc/library.go

@@ -484,6 +484,7 @@ func (library *libraryDecorator) linkShared(ctx ModuleContext,
 	flags Flags, deps PathDeps, objs Objects) android.Path {
 
 	var linkerDeps android.Paths
+	linkerDeps = append(linkerDeps, flags.LdFlagsDeps...)
 
 	versionScript := android.OptionalPathForModuleSrc(ctx, library.Properties.Version_script)
 	unexportedSymbols := android.OptionalPathForModuleSrc(ctx, library.Properties.Unexported_symbols_list)
@@ -628,7 +629,6 @@ func (library *libraryDecorator) link(ctx ModuleContext,
 	flags Flags, deps PathDeps, objs Objects) android.Path {
 
 	objs = objs.Append(deps.Objs)
-
 	var out android.Path
 	if library.static() || library.header() {
 		out = library.linkStatic(ctx, flags, deps, objs)