gsimple-template-names

Based on: https://chromium-review.googlesource.com/c/chromium/src/+/3988987

```
Savings are almost 330M on 11G

du -s out.diff/target/product/vsoc_arm64/symbols
10751692        out.diff/target/product/vsoc_arm64/symbols
du -s out/target/product/vsoc_arm64/symbols
11086508        out/target/product/vsoc_arm64/symbols
```

Change-Id: I49a5c4cadc77cb0d97e680e95c4efa7156a42f13
diff --git a/cc/config/global.go b/cc/config/global.go
index 013b659..7f9a6e0 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -111,6 +111,9 @@
 
 		// Turn off FMA which got enabled by default in clang-r445002 (http://b/218805949)
 		"-ffp-contract=off",
+
+		// Using simple template names reduces the size of debug builds.
+		"-gsimple-template-names",
 	}
 
 	commonGlobalConlyflags = []string{}