R600: Fix segfault in R600TextureIntrinsicReplacer

This pass was segfaulting when it ran into a non-intrinsic function
call.  Function calls are not supported, so now instead of segfaulting,
we will get an assertion failure with a nice error message.

I'm not sure how to test this using lit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190076 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/R600/R600TextureIntrinsicsReplacer.cpp

@@ -260,6 +260,9 @@ public:
   }
 
   void visitCallInst(CallInst &I) {
+    if (!I.getCalledFunction()) {
+      return;
+    }
     StringRef Name = I.getCalledFunction()->getName();
     if (Name == "llvm.AMDGPU.tex") {
       ReplaceTexIntrinsic(I, false, TexSign, "llvm.R600.tex", "llvm.R600.texc");