New testcase, do not emit a call to __builtin_sqrt, emit a call to sqrt instead!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11668 91177308-0d34-0410-b5e6-96231b3b80d8

test/CFrontend/2004-02-20-Builtins.c.tr

@@ -0,0 +1,6 @@
+// RUN: %llvmgcc -O3 -xc %s -c -o - | llvm-dis | not grep builtin
+
+void zsqrtxxx(float num) {
+   num = sqrt(num);
+}
+