Revert "[pgo] Return updated Flags after adding flags for PGO/AFDO"

This reverts commit 5010a973880e0b8abef598cf4c0ca8de8add16fd.

Reason for revert:  b/166728338 - build failures on master branch

Bug: 162702246
Bug: 166728338
Change-Id: Ie9e51e7c5533d220ad3e160439cb38ff88f068ac
Test: TreeHugger
diff --git a/cc/pgo.go b/cc/pgo.go
index 6bf0ad0..674e1bb 100644
--- a/cc/pgo.go
+++ b/cc/pgo.go
@@ -290,16 +290,17 @@
 
 	// Add flags to profile this module based on its profile_kind
 	if props.ShouldProfileModule && props.isInstrumentation() {
+		props.addInstrumentationProfileGatherFlags(ctx, flags)
 		// Instrumentation PGO use and gather flags cannot coexist.
-		return props.addInstrumentationProfileGatherFlags(ctx, flags)
+		return flags
 	} else if props.ShouldProfileModule && props.isSampling() {
-		flags = props.addSamplingProfileGatherFlags(ctx, flags)
+		props.addSamplingProfileGatherFlags(ctx, flags)
 	} else if ctx.DeviceConfig().SamplingPGO() {
-		flags = props.addSamplingProfileGatherFlags(ctx, flags)
+		props.addSamplingProfileGatherFlags(ctx, flags)
 	}
 
 	if !ctx.Config().IsEnvTrue("ANDROID_PGO_NO_PROFILE_USE") {
-		flags = props.addProfileUseFlags(ctx, flags)
+		props.addProfileUseFlags(ctx, flags)
 	}
 
 	return flags