Update to a newer version of llvm

llvm_revision.txt

-206654
+208817

src/codegen/irgen.cpp

@@ -848,6 +848,11 @@ static llvm::MDNode* setupDebugInfo(SourceInfo* source, llvm::Function* f, std::
     llvm::DICompositeType func_type = builder.createSubroutineType(file, param_types);
     llvm::DISubprogram func_info = builder.createFunction(file, f->getName(), f->getName(), file, lineno, func_type,
                                                           false, true, lineno + 1, 0, true, f);
+
+    // The 'variables' field gets initialized with a tag-prefixed array, but
+    // a later verifier asserts that there is no tag.  Replace it with an empty array:
+    func_info.getVariables()->replaceAllUsesWith(builder.getOrCreateArray(llvm::ArrayRef<llvm::Value*>()));
+
     llvm::DICompileUnit compile_unit
         = builder.createCompileUnit(llvm::dwarf::DW_LANG_Python, fn, dir, producer, true, "", 0);
 

tools/find_problem.py

@@ -4,9 +4,9 @@ import subprocess
 import sys
 
 def test(rev, args):
-    subprocess.check_call(["make", "llvm_gitup", "LLVM_REVISION=%d" % rev])
-    subprocess.check_call(["make", "llvm_release", "llvm_quick", "LLVM_REVISION=%d" % rev])
-    code = subprocess.call(["make", "LLVM_REVISION=%d" % rev] + args)
+    subprocess.check_call(["make", "llvm_up", "USE_TEST_LLVM=1", "LLVM_REVISION=%d" % rev])
+    subprocess.check_call(["make", "llvm_release", "llvm_quick", "USE_TEST_LLVM=1", "LLVM_REVISION=%d" % rev])
+    code = subprocess.call(["make", "USE_TEST_LLVM=1", "LLVM_REVISION=%d" % rev] + args)
     return code == 0
 
 def efficiency(rid):