Add no-frame-pointer-elim attribute to all functions

func.cpp

@@ -248,6 +248,11 @@ Function::emitCode(FunctionEmitContext *ctx, llvm::Function *function,
     maskSymbol->pos = firstStmtPos;
     ctx->EmitVariableDebugInfo(maskSymbol);
 
+#if ISPC_LLVM_VERSION >= ISPC_LLVM_3_7 // LLVM 3.7+
+    if (g->NoOmitFramePointer)
+        function->addFnAttr("no-frame-pointer-elim", "true");
+#endif
+
 #if 0
     llvm::BasicBlock *entryBBlock = ctx->GetCurrentBasicBlock();
 #endif