gollvm: fix index buglet in FAQ

Fix missing index entry in previous change:

Change-Id: Ib940aeb740500b68efa8c92f80d1f23d079daaf8
Reviewed-on: https://go-review.googlesource.com/c/154737
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
diff --git a/README.md b/README.md
index a2cd96b..460d232 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,8 @@
   * [What is the relationship between gollvm and gccgo?](#gollvmandgccgo)
   * [Can I use FDO or Thin LTO with gollvm?](#thinltofdo)
   * [Can I use the race detector?](#racedetector)
+  * [I am seeing "undefined symbol: `__get_cpuid_count`" from my gollvm install](#getcpuidcount_undefined)
 # Building gollvm <a name="building"></a>
 Gollvm is currently in development -- releases are not yet available for download.  Instructions for building gollvm follow.