Fix some llvm-gcc warnings in testcases, mostly by adding includes or adding
declarations. These are the fixes that I was pretty confident about, there are
still a lot of other llvm-gcc warnings of which I'm not sure if they can be
safely ignored or fixed, without breaking the test case.

This fixes 11 testcases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52176 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/FrontendC/2004-02-20-Builtins.c b/test/FrontendC/2004-02-20-Builtins.c
index 82b7dc1..0c9ac7c 100644
--- a/test/FrontendC/2004-02-20-Builtins.c
+++ b/test/FrontendC/2004-02-20-Builtins.c
@@ -1,5 +1,7 @@
 // RUN: %llvmgcc -O3 -xc %s -c -o - | llvm-dis | not grep builtin
 
+#include <math.h>
+
 void zsqrtxxx(float num) {
    num = sqrt(num);
 }