Migrate CodeGen/2009-09-24-SqrtErrno.c from test/FrontendC with changes

to avoid header inclusions.

llvm-svn: 136128

clang/test/CodeGen/2009-09-24-SqrtErrno.c

@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 %s -emit-llvm -o - -fmath-errno | FileCheck %s
+// llvm.sqrt has undefined behavior on negative inputs, so it is
+// inappropriate to translate C/C++ sqrt to this.
+
+float sqrtf(float x);
+float foo(float X) {
+// CHECK: foo
+// CHECK-NOT: readonly
+// CHECK: call float @sqrtf
+  // Check that this is not marked readonly when errno is used.
+  return sqrtf(X);
+}