Fix a crash when compiling blocks in OpenCL with multiple
address spaces.

llvm-svn: 215629
diff --git a/clang/test/CodeGen/blocks-opencl.cl b/clang/test/CodeGen/blocks-opencl.cl
new file mode 100644
index 0000000..ab80f5e
--- /dev/null
+++ b/clang/test/CodeGen/blocks-opencl.cl
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -O0 %s -ffake-address-space-map -emit-llvm -o - -fblocks -triple x86_64-unknown-unknown | FileCheck %s
+// This used to crash due to trying to generate a bitcase from a cstring
+// in the constant address space to i8* in AS0.
+
+void dummy(float (^op)(float))
+{
+}
+
+// CHECK: i8 addrspace(3)* getelementptr inbounds ([9 x i8] addrspace(3)* @.str, i32 0, i32 0)
+
+kernel void test_block()
+{
+  float (^X)(float) = ^(float x) { return x + 42.0f; };
+  dummy(X);
+}
+