Revert "Enable hot cold split"

This reverts commit 4e28d0eda28baf77704046379c63fc7a3ee51a93.

Reason for revert: Reverting now that we should have sufficient data from Crystalball https://b.corp.google.com/issues/306023954

Change-Id: I9f92c203eda309956ec192432ba0063eb11f59e2
diff --git a/cc/config/global.go b/cc/config/global.go
index 0354b25..62b008b 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -170,9 +170,6 @@
 
 		// Emit additional debug info for AutoFDO
 		"-fdebug-info-for-profiling",
-
-		// Enable Hot Cold splitting optimization.
-		"-mllvm -hot-cold-split=true",
 	}
 
 	commonGlobalLldflags = []string{