Use -fno-omit-frame-pointer for host darwin.

Helps with debugging/profiling.

Bug: http://b/245707217
Change-Id: Ifbe2f6d05059d4ffee5c33ddec743188164100ef
diff --git a/cc/config/darwin_host.go b/cc/config/darwin_host.go
index 2ea607a..1783f49 100644
--- a/cc/config/darwin_host.go
+++ b/cc/config/darwin_host.go
@@ -29,6 +29,7 @@
 	darwinCflags = []string{
 		"-fPIC",
 		"-funwind-tables",
+		"-fno-omit-frame-pointer",
 
 		"-isysroot ${macSdkRoot}",
 		"-mmacosx-version-min=${macMinVersion}",